Question

Find the missing side length for JI given the models perimeter on the left is 34cm. (Just put the number, don't add any letters)

Answer 1

10.5

Explanation:

If the perimeter is 34, all the sides add to 34

12 + 5 + 7 + 4+ DE = 34

28 + DE = 34 Subtract 28 from both sides.

28 - 28 + DE = 34 - 28

DE = 6

Set up the the proportion

12 / 21 = 6/JI Cross multiply

12*JI = 21 * 6 Combine the right

12*JI = 126 Divide both sides by 12

JI = 126/12 Divide

JI = 10.5