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------- = 260
2
s = 52/4
s = 13 cm
d1 = 10
1/2 d2 = √13²-(10/2)² = √169-25 = √144 = 12 cm
d2 = 12 x 2 = 24 cm
L = d1.d2 / 2 = 10 x 24 / 2 = 120 cm²