CBSE Class 9CBSE
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Introduction to Area of a Triangle

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notes

The triangle is right angled, we can directly apply the formula by using two sides containing the right angle as base and height. 

Area of a triangle = `1/2 xx base xx height`

For example : 
suppose that the sides of a right triangle ABC are 5 cm, 12 cm and 13 cm; we take base as 12 cm and height as 5 cm in following fig.

Then the area of ∆ ABC is given by
`1/2 xx base xx height`
= `1/2 xx 12 xx 5  cm^2`,  i.e., 30 `"cm"^2`.

S
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