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D 1 = D2
7x - 8 = 4x +7
3x = 15
x= 15/3 = 5
P. diagonal = 7x-8 = 35-8 = 27cm
2. 4S = Kliling
4S = 60
S = 60/4 = 15cm
9² + 1/2D2² = 15²
1/2D2² = 225-81
1/2D2= √144 = 12
D2 = 12 x 2 = 24cm