13) The perimeter of a triangle is 69 cm. The first side is 5 cm shorter than the second side. The third side is twice as long as the first side. Find the length of each side.

Answer 1

F=S-5 or S=F+5

T=2F

F+S + T = 69

F + F+5 + 2F = 69

4F = 64

F = 16 cm for the first side

S = 21 cm for second side

T = 32 cm for third side

16+21+32 = 69 cm