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Lelechka [254]
3 years ago
5

8. The square and equilateral triangle below have equal perimeters. Find the value of x. Then, calculate the perimeter of each s

hape. 78 - 8.1 10x - 13 x: 8 Perimeter: 9​

Mathematics
1 answer:
babunello [35]3 years ago
3 0

Answer:

x=3.3

P = 60

Step-by-step explanation:

The perimeter of the square is

P = 4s

   = 4(7x-8.1)

    =28x -32.4

The perimeter of the equilateral triangle is

P = 3s

   = 3(10x-13)

    =30x-39

The perimeters are equal

28x -32.4 = 30x-39

Subtract 28x from each side

28x-28x -32.4 = 30x-28x-39

-32.4 = 2x-39

Add 39 to each side

-32.4 +39 = 2x-39+39

6.6 = 2x

Divide by 2

6.6/2 = 2x/2

3.3 =x

The perimeter is

30x-39 = 30*3.3 -39 = 99-39 = 60

                           

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