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3 - 6

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Area of a Triangle

Theory & Practice Questions.

 

Lesson

Area of a Triangle

Area of a triangle = 1/2 base of the triangle x the perpendicular height

[Formula]

  A = 1/2 bh 

 

area of a triangle diagram

 

Example

Find the area of the triangle.

area of a triangle question

 

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.

area of a triangle question 2

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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