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2. 2 Get a rectangular piece of paper and cut it diagonally as shown below. You will obtain two triangles with each triangle having half the area of the triangles.

3. 3 The formula for calculating the area of a triangle is: Area of ∆ = ½ x base x height Area of Triangle = ½ x area of rectangle = ½ x length x width (of rectangle) = ½ x length x width (of rectangle) = ½ x base x height (of triangle) Length (Base) Width (Height )

4. 4 Calculate the area of ∆ RST. Answer: The area of ∆ RST is 42 square centimetres or 42 cm². Area of ∆ RST = ½ x base x height 14 cm 6 cm = ½ x 6 cm x 14 cm = 42 square centimetres or 42 cm²

5. 5 Calculate the area of ∆ LMN. Answer: The area of ∆ LMN is 28 square centimetres or 28 cm². Area of ∆ LMN = ½ x base x height 8 cm 7 cm = ½ x 7 cm x 8 cm = 28 square centimetres or 28 cm²

6. 6 Calculate the area of the triangle. Area = _____ square metres or ______ m². 15 m 9 m 67.5

7. 7 Calculate the area of the triangle. Area = ___ square centimetres or _____ cm². 18 cm 15 cm 135

8. 8 Calculate the area of the triangle. Area = _____ square metres or ______ m². 28 m 17 m 238