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= √(3,5)²+(12²)
= √(12,25+144)
= √156,25
= 12,5 cm
jadi,
L sisi krucut
= phi.r.(r+s)
= 22/7.3,5.(3,5+12,5)
= 22/2 . 16
= 11 . 16
= 176 cm²