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BC = akar 25 cm x 16 cm
BC = akar 400
Bc = 20 cm
16²+DC² = BC².....1
9²+DC² = AC².....2
subtitusi AC dan BC:
AC²+BC² = 25²
9²+DC²+16²+DC² = 25²
81+2.DC²+256 = 625
2.DC² = 625-337
2.DC² = 288
DC² = 144
DC = 12
16²+DC² = BC²
BC² = 256+144
BC = √400
BC = 20 cm........opsi B