6 Slides • 3 Questions

Area of a Triangle

2

In the past, to find the area of a triangle we have used the formula

A=(1/2)bh

where b=base h=height

But, if we do not know the height of a triangle, we can use trigonometry to help us determine the area

3

In order to find the area of a triangle using trigonometry, we need the 2 side lengths and the angle that lies in between the two sides

Then, we can use the formula

A=(1/2)ab*sin(C)

4

Why does this work?

A=(1/2)bh

5

Example:

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Fill in the Blanks

7

Fill in the Blanks

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Fill in the Blanks

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Work on:

pg. 540 #4, 6, 7, 9

Area of a Triangle

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