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)

10.5

Step-by-step 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

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x