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= √ 64 + 36
= √ 100
= 10cm
sisi bawah = √ 8² + 15²
= √ 64 + 225
= √ 289
= 17cm
Keliling = 2 ( 10 + 17 )
= 2 x 27
= 54cm
2
= 16 X 21
2
= 336 / 2 = 168 cm²