Question

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

Answer 1

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)