# Computing

## CONTENTS OF CURRICULUM UNIT 81.06.04

- Introduction
- The Meaning of Area
- Area of a Rectangle
- Computer Programs to Calculate the Area of a Rectangle
- Area of a Square
- Computer Programs to Calculate the Area of a Square
- Area of a Parallelogram
- Computer Programs to Calculate the Area of a Parallelogram
- Area of a Triangle
- Computer Program to Calculate the Area of a Triangle
- Area of a Trapezoid
- Computer Program to Calculate the Area of a Trapezoid
- Bibliography for Teachers
- Student Reading List

### Unit Guide

## Introducing Computer Programming in a Traditional Classroom

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Area of
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a
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Rectangle
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*(figure available in print form)*

*(figure available in print form)*

Area of a Rectangle = Base x Altitude or A= bh

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Example
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1: Find the area of a rectangle whose base is 12.5 cm. and whose altitude is 18.6 cm. in length.

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Solution
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: A- bh A = 12.5 x 18.6 = 232.50 square centimeters

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Example
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2: Find the area of a rectangle whose base is 9 in. and whose altitude is 3 ft. in length

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Solution
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: The base and altitude must be represented by the same unit of measure before finding the area. h =3 feet or 3 x 12 = 36 inches

____ Area= bh Area = 9 x 36 = 324 square inches

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Example
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3: Find the area of the figure on the left below.

*(figure available in print form)*

*Solution*: Divide the figure into rectangles as shown. Find the area of each rectangle. Add the areas of the rectangles to find the total area of the figure.

Area I | 5 x 4 | = 20 square units |

Area II | 2 x 3 | = 6 square units |

Area III | 12 x 2 | = 24 square units |

Total Area | 50 square units |

- 1. Find the area of rectangle EFGH with EF = 9.2 mm. and FG = 11.7 mm.
- 2. What is the length of the base of a rectangle whose area is 336 sq. ft. and whose altitude is 14 feet?
- 3. Find the area of a rectangle whose base is 30 yd. and whose diagonal is 34 yd.
- 4. Find the area of a rectangle whose base is 25 yd. and whose altitude is S2 ft.
- 5. Find the cost of painting four rectangular surfaces, each 22 ft. by 15 ft., if 1 gallon of paint will cover 100 sq. ft. and costs $14.95 a gallon.
- 6. Find the areas of the following figures:

*(figure available in print form)*