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I have to find the area of this?????

I have to find the area of this?????-example-1

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Explanation:

Part 1: How to calculate the width

1-


a ^(2) + b ^(2) = c ^(2)

This is pythagoras theorem. the slanted side is C so fill it in with 89 and the right side can either be a or b; let's say b. now fill this in.

2-


a ^(2) + 39 ^(2) = 89 ^(2)

Now work out the squares (squaring means multiplying a number by itself)

2-


{a}^(2) + 1521 = 7921

3- a2=7921-1521 work out the subtraction (a2 means a squared)

4- a2= 6400 Now take the root of that because you want to know a not a squared.

5-


√(6400) = 80

A equals 80

Part 2: calculating area

1- the formula for the area of a triangle is area= 1/2 × length x width

2- 1/2 × 39 x 80= 3120 cm2 ( cm squared)

User Dina Bogdan
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