Area of Triangles, Parallelograms, Kites and Trapeziums

10.2 Area of Triangles, Parallelograms, Kites and Trapeziums

10.2

Area of Triangles, Parallelograms, Kites and Trapeziums

Estimate the area of various shapes:

(i) Using a grid with equal squares of sides \(1\text{ unit}\)

Example

(ii) Drawing lines \(1\text{ unit}\) apart

Example

The formulae for the area of various shapes:

(i) The area of a triangle

\(\begin{aligned} \text{Area} &=\dfrac{1}{2}ab \end{aligned}\)

(ii) The area of a paralellogram

\(\begin{aligned} \text{Area} &=ab \end{aligned}\)

(iii) The area of a kite

\(\begin{aligned} \text{Area} &=\dfrac{1}{2}ab \end{aligned}\)

(iv) The area of the trapezium

\(\begin{aligned} \text{Area} &=\dfrac{1}{2}(a+b)t \end{aligned}\)

Quick Notes