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20 ×d2=960
d2=48
keliling=4√(10²+24²)
keliling=104 cm
480 = 1/2 x 20 x d2
d2 = 480/10
d2 = 48
s = √24² + 10²
=√576 +100
=√676 =26
k=4 x s = 4 x 26 = 104 cm