Select three sets of numbers that can be the side lengths of a right triangle 5, 6, 8
7, 24, 25
8, 10, 12
20, 21, 29
12, 35, 37

4th choice, 20, 21, 29 would be the answer.

Step-by-step explanation:

Pythagorean Theorem: a^2 + b^2 = c^2

a= 20, b= 21, c= 29 ( c has to be the C, hypotenuse, because it is the longest)

therefore,

20^2 + 21^2 = 29^2

              into

400 + 441 = 841,

which is true, makes the Pythagorean Theorem work.

13.46

step-by-step explanation:

16.80 x .20 = 13.46

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.