Lesson
Area of a Triangle
Area of a triangle = 1/2 base of the triangle x the perpendicular height
[Formula]
| A = 1/2 bh |
Example
Find the area of the triangle.
Explanation
Area of a triangle = 1/2 base of the triangle x the perpendicular height
A = 1/2 bh
Substitute given values into the formula
A = 1/2 x 8 x 4
A = 16 m²
Question
Find the area of the following. Lengths are given in millimetres.
Solution
Area of a triangle = 1/2 x base x ⊥
A = 1/2 x 40 x 20
A = 1/2 x 800
A = 400 mm²
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