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= 68/4
= 17 cm
KL = 17 cm
OL = √17² - 8²
= √225
= 15
D₂ = 2.OL
= 2. 15
= 30 cm
L = 1/2. D₁. D₂
= 1/2. 30. 16
= 240 cm²
2. Busur 1/2 lingkaran = 1/2. 2πr
= π r
= 22/7. 7
= 22 cm
Keliling = 14+20+22+20
= 76 cm