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4S = 60
S = 60/4 = 15 cm
(1/2D1)² + (1/2D2)² = S²
( 1/2.18)² + (1/2D2)² = 15²
9² + (1/2D2)² = 225
(1/2D2)² = 225 - 81
= 144
1/2D2 =√144 = 12
D2 = 12 x 2
Diagonal2 = 24cm