1. Areas and Perimeter of Rectangles, Square, Triangles and Circles
Sec 1 Express Mathematics
Chapter 14:
Areas and Perimeter of Rectangles, Square, Triangles and Circles

2. Sec 1 Express Mathematics
ICT Lesson Outline
14.1: Revision on area of triangles, rectangles, squares, circles.
Perimeter & Area of Parallelogram
14.2: Perimeter & Area of Trapezium
14.3: Perimeter & Area of Parallelogram

3. 14.1: Perimeter of Rectangle
The opposite sides of a rectangle are the same length. The perimeter equals 2 times the length (L) plus 2 times the width (W).
Perimeter of a rectangle: P = 2(L + W)
W = Width
L = Length

4. Area of Rectangle
Area of rectangle is calculated by multiplying the length (L) and the width of the rectangle (W).
W = Width
L = Length

5. Perimeter of Square
To find the perimeter of a square, just add up all the lengths of the sides:
Area2
Length
Length

6. Area of Square
Area of square is calculated the area of a square is calculated by multiplying the length of the base by the height.
Area2
Height
Base

7. Area of Triangles Area of triangle = ( 1 2 × base × height) Height

8. Area of Circles
Area of circle = π 𝑟 2 where r is the radius of a circle.