Sec 1 Express Mathematics

Chapter 14:

Perimeter and Area of Plane Figures

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

Sec 1 Express Mathematics

14.2 Introduction to Trapeziums

A trapezium is • a 4-sided flat shape with straight sides • a pair of opposite sides parallel

Sec 1 Express Mathematics

Area of trapezium

Watch this video:https://www.youtube.com/watch?v=UYrhj3h35sU

Sec 1 Express Mathematics

Area of trapeziumHow the formula is obtained? (optional)

Sec 1 Express Mathematics

Area of trapeziumHow the formula is obtained? (optional)

Sec 1 Express Mathematics

Summary: Area of trapezium

= 1/2 x (sum of parallel sides) x height

Sec 1 Express Mathematics

Practice question (1)

Solution:

v

Sec 1 Express Mathematics

Practice question (2)

Solution:

Sec 1 Express Mathematics

Perimeter of trapezium

Perimeter = Sum of all 4 sides = a + b + c + d