Home MATHEMATICS TOPIC 11: PERIMETERS AND AREAS ~ MATHEMATICS FORM 1

TOPIC 11: PERIMETERS AND AREAS ~ MATHEMATICS FORM 1

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NUMBERS
Β Perimeters of Triangles and Quadrilaterals
The Perimeters of Triangles and Quadrilaterals
Find the perimeters of triangles and quadrilaterals
Perimeter – is defined as the total length of a closed shape. It is obtained by adding the lengths of the sides inclosing the shape. Perimeter can be measured in π‘šπ‘š , π‘π‘š ,π‘‘π‘š ,π‘š,π‘˜π‘š e. t. c
Examples
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Example 1
Find the perimeters of the following shapes
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Solution
  1. Perimeter = 7π‘š + 7π‘š + 3π‘š + 3π‘š = 20 π‘š
  2. Perimeter = 2π‘š + 4π‘š + 5π‘š = 11 π‘š
  3. Perimeter = 3π‘π‘š + 6π‘π‘š + 4π‘π‘š + 5π‘π‘š + 5 π‘π‘š + 4π‘π‘š = 27 π‘π‘š
Areas of Circle
Calculate areas of circle
Consider a circle of radius r;
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Example 5
Find the areas of the following figures
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Solution
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Example 6
A circle has a circumference of 30 π‘š. What is its area?
Solution
Given circumference, 𝐢 = 30 π‘š
C = 2πœ‹π‘Ÿ
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