Sec 1 Express Mathematics

Chapter 14:

Areas and Perimeter of Rectangles, Square, Triangles and Circles

Sec 1 Express Mathematics

ICT Lesson Outline14.1: Revision on area of triangles, rectangles, squares, circles.

Perimeter & Area of Parallelogram

14.2: Perimeter & Area of Trapezium

14.3: Perimeter & Area of Parallelogram

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

Area of Rectangle

• Area of rectangle is calculated by multiplying the length (L) and the width of the rectangle (W).

W = Width

L = Length

Perimeter of Square

• To find the perimeter of a square, just add up all the lengths of the sides:

Area2 Length

Length

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

Area of Triangles

• Area of triangle = ( base × height)

Base

Height

Area of Circles

• Area of circle = π where r is the radius of a circle.