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= 1/2 x (6+8+10)
= 1/2 x 24
= 12 cm
Luas = 1/2 x a x t
L = 1/2 x 6 x 8
= 24 cm²
panjang jari-jari lingkaran dalam:
r = L/s
= 24/12
= 2 cm
semoga membantu :)