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= 60/360 . 2 phi.r
= 1/6 . 2.22/7.7
= 7,33 cm
b) L.juring COD = sudut COD/360 . L lingkaran
= 90/360 . phi.r²
= 1/4.22/7.7²
= 38,5 cm²
4. a) L.juring QPR = sudut QPR/360 . L lingkaran
= 90/360 .phi.r²
= 1/4.3,14 10²
= 78,5 cm²
b) L.segitiga PQR = 1/2.a.t
= 1/2.PR.PQ
= 1/2.10.10
= 50 cm²
c) L.tembereng QR = L.juring QPR - L.segitiga PQR
= 78,5 - 50
= 28,5 cm²
5. a) sudut M = kok sudut2e d gambar burem gt,tolong dprjelas