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Step-by-step explanation:

In triangle

x²=5²+12²

x²=25+144

x²=169

x= root of 169

x=13

13

Step-by-step explanation:

A^2+B^2=C^2

5=A 12=B X=C

C is is always the longest side of a right triangle.

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6