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

TOPIC 11: PERIMETERS AND AREAS ~ MATHEMATICS FORM 1

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Geometry Points and Lines

PERIMETERS AND AREAS

Perimeters of Triangles and Quadrilaterals
The Perimeters of Triangles and Quadrilaterals
Find the perimeters of triangles and quadrilaterals
Perimeter โ€“ 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 ๐‘š๐‘š , ๐‘๐‘š ,๐‘‘๐‘š ,๐‘š,๐‘˜๐‘š e. t. c
PERIMETERS AND AREAS

Examples

PERIMETERS AND AREAS
Example 1
Find the perimeters of the following shapes
Solution
  1. Perimeter = 7๐‘š + 7๐‘š + 3๐‘š + 3๐‘š = 20 ๐‘š
  2. Perimeter = 2๐‘š + 4๐‘š + 5๐‘š = 11 ๐‘š
  3. Perimeter = 3๐‘๐‘š + 6๐‘๐‘š + 4๐‘๐‘š + 5๐‘๐‘š + 5 ๐‘๐‘š + 4๐‘๐‘š = 27 ๐‘๐‘š
Areas of Circle
Calculate areas of circle
Consider a circle of radius r;
PERIMETERS AND AREAS

Example 5

Find the areas of the following figures
Solution
PERIMETERS AND AREAS

Example 6

A circle has a circumference of 30 ๐‘š. What is its area?
Solution
Given circumference, ๐ถ = 30 ๐‘š
C = 2๐œ‹๐‘Ÿ
PERIMETERS AND AREAS

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