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60= 4s
s= 60/4 = 15
panjang diagonal 1 = p1
panjang diagonal 2 = p2
p1=24
1/2p2= s²- (1/2p1)²
1/2p2= 15² - 12²
1/2p2=√225 - 144
1/2p2=√81 = 9
p2= 9 x 2 = 18
L = 1/2 p1 p2
L = 1/2 x 24 x 18
L = 216 cm²