DuckieDai Rectangle Area Python Program

geometry · MIT License

Overview

Calculate a rectangle's area while showing the formula, accepting a user-chosen length unit, and labelling the squared result.

Tested on a TI calculator
Downloaded 39 times
Version 1.0.0
2167 bytes
No imports

Download rectangle_area.py Read the source How to install

Before you run it

TI-84 Plus CE Python · tested on OS 5.8.3, Python App 5.8.3.0048
Sent through TI Connect CE to the Python App; DuckieDai named the calculator copy TEST
Width and height describe a rectangle and use the same unit.
Each dimension must be greater than zero and below 1e100.
The calculated area must be below 1e200.

Try the DuckieDai calculator screen

See the duck opening, enter a unit and dimensions, and follow the prompts through to the area result.

JavaScript is required for the optional browser simulation. Source viewing and downloading remain available without it.

Simulation boundary: This preview uses a reviewed browser adapter. It does not execute the downloaded Python and does not prove TI-Python or calculator compatibility.

Learn the math

How the area of a rectangle works

The idea

Area measures how much flat space a shape covers. For a rectangle it is the width multiplied by the height, and the answer is in square units.

The formula

A = width x height

A: area, in square units
width, height: the two side lengths, in the same unit

Using the program

Type the unit you are using, such as cm, m, or in.
Enter the width and the height. The program labels the answer with your unit squared.

Worked example

A rectangle is 4 cm wide and 2.5 cm tall. Enter cm, then 4 and 2.5.

A = 4.0 x 2.5

The program shows Area = 10.0 cm^2.

Tips and common mistakes

Both sides must be in the same unit before you multiply.
Area is in square units; perimeter is not. They answer different questions.
This is the simplest program in the library and a good first one to transfer and try.

Where this comes up

Area of a rectangle is the first area formula taught and the basis for every other one. Here it mainly serves as a simple first program to transfer and run.

Read the step-by-step browser preview guide to try a sample and understand what the preview does and does not test.

Exact reviewed bytes

Source code

Download .py

View source below, copy it when JavaScript is available, or download the exact .py bytes.

"""DuckieDai Rectangle Area for TI-84 Plus CE Python."""


def duckiedai_intro(program_name, wait=True):
    """Show the small, reusable DuckieDai program opening."""
    title = program_name[:16]
    empty = 16 - len(title)
    left = empty // 2
    right = empty - left
    print("+----------------------+")
    print("|   " + " " * left + title + " " * right + "   |")
    print("|                      |")
    print("|       __             |")
    print("|   ___(o )>  quack!   |")
    print("|   \\ <_. )           |")
    print("|    `---'             |")
    print("|     by DuckieDai     |")
    print("+----------------------+")
    print("Loading...")
    if wait:
        input("Press enter to start ")
        print("\n" * 6)


def positive_number(prompt):
    """Ask until the user supplies a positive, finite number."""
    while True:
        try:
            value = float(input(prompt))
            if is_positive_finite(value):
                return value
        except ValueError:
            pass
        print("Enter a number above 0.")


def is_positive_finite(value):
    """Use a practical calculator range without math.isfinite."""
    return value > 0 and value < 1e100


def rectangle_area(width, height):
    """Return area for two positive, finite dimensions."""
    if not is_positive_finite(width) or not is_positive_finite(height):
        raise ValueError("dimensions must be positive and finite")
    area = width * height
    if area >= 1e200:
        raise ValueError("area is too large")
    return area


def main():
    duckiedai_intro("RECTANGLE AREA")
    print("RECTANGLE AREA")
    print("Formula: A = width x height")
    print()
    unit = input("Length unit (cm, m, in): ")
    if not unit:
        unit = "units"
    width = positive_number("Width in " + unit + ": ")
    height = positive_number("Height in " + unit + ": ")
    area = rectangle_area(width, height)
    print()
    print("A = " + str(width) + " x " + str(height))
    print("Area = " + str(area) + " " + unit + "^2")
    print()
    print("DuckieDai says: done!")


# TI-Python imports the selected AppVar rather than setting __name__ to main.
main()

"""DuckieDai Rectangle Area for TI-84 Plus CE Python."""
def duckiedai_intro(program_name, wait=True):
"""Show the small, reusable DuckieDai program opening."""
title = program_name[:16]
empty = 16 - len(title)
left = empty // 2
right = empty - left
print("+----------------------+")
print("| " + " " * left + title + " " * right + " |")
print("| |")
print("| __ |")
print("| ___(o )> quack! |")
print("| \\ <_. ) |")
print("| `---' |")
print("| by DuckieDai |")
print("+----------------------+")
print("Loading...")
if wait:
input("Press enter to start ")
print("\n" * 6)
def positive_number(prompt):
"""Ask until the user supplies a positive, finite number."""
while True:
try:
value = float(input(prompt))
if is_positive_finite(value):
return value
except ValueError:
pass
print("Enter a number above 0.")
def is_positive_finite(value):
"""Use a practical calculator range without math.isfinite."""
return value > 0 and value < 1e100
def rectangle_area(width, height):
"""Return area for two positive, finite dimensions."""
if not is_positive_finite(width) or not is_positive_finite(height):
raise ValueError("dimensions must be positive and finite")
area = width * height
if area >= 1e200:
raise ValueError("area is too large")
return area
def main():
duckiedai_intro("RECTANGLE AREA")
print("RECTANGLE AREA")
print("Formula: A = width x height")
print()
unit = input("Length unit (cm, m, in): ")
if not unit:
unit = "units"
width = positive_number("Width in " + unit + ": ")
height = positive_number("Height in " + unit + ": ")
area = rectangle_area(width, height)
print()
print("A = " + str(width) + " x " + str(height))
print("Area = " + str(area) + " " + unit + "^2")
print()
print("DuckieDai says: done!")
# TI-Python imports the selected AppVar rather than setting __name__ to main.
main()

Filename: rectangle_area.py
Size: 2167 bytes
SHA-256: 5291290b23032d479d34f740ca41a5a13f96a036636544784054aadfa6478b32

Usage

Inputs

Length unit: a short label such as cm, m, or in; blank becomes units
Width: positive number below 1e100 in the chosen unit
Height: positive number below 1e100 in the chosen unit

Outputs

Area: width multiplied by height, labelled with the chosen unit squared

Units: Width and height must share one length unit; output uses that unit squared.

Assumptions and limitations

Assumptions

Width and height describe a rectangle and use the same unit.

Constraints

Each dimension must be greater than zero and below 1e100.
The calculated area must be below 1e200.

Known failures

Non-numeric, zero, negative, or excessively large dimensions are rejected and requested again.
Very long custom unit labels may wrap on the calculator display.

Compatibility and review

Review status: Tested on a TI calculator
Tested on: TI-84 Plus CE Python; OS 5.8.3; Python App 5.8.3.0048; transferred through TI Connect CE as TEST
What happened: The duck opening appeared, and the calculator accepted a unit and rectangle dimensions before displaying the labelled area answer.
Dependencies: No imports
Suggested calculator name: RECTAREA — you can give it another valid, unique name when you transfer it
Desktop test cases: 5 cases

The desktop tests cover calculations and error handling. The calculator review above records what was actually checked on the device.

Transfer and launch

Download the .py file, send it to your calculator with TI Connect CE as RECTAREA or another name, then open the Python App and try the worked example on this page first.

Full installation and troubleshooting guide. Check your teacher's or exam's rules before using any program.

Version history

1.0.0 — current version, published 2026-09-22. Download this reviewed version

Related guide

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