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960=60xd2/2
D2= 32
lalu phitagoras 16^2 + 30^2 =289 =>> 17
keliling 17x 4 = 68
luas 960cm²
diagonal BD = 960/ 1/2×60 = 32 cm
AD = (1/2 × 60)² + (1/2 × 32)² = 34
keliling = 4× AD = 4 × 34 = 136 cm