WindaFANG
4. cari jari2nya dulu = kll lingkaran = 2 x phi x r 44 = 2 x 22/7 x r 44 = 44r/7 308 = 44r r = 7cm luas = phi x r x r 22/7 x 7 x 7 154cm² (b) 5. luas seperempat lingkaran = 1/4 x 22/7 x.14 x.14 154cm² luas segitiga (yg tidak diarsir) = 1/2 x 14 x 14 = 98cm² luas daerah yg diarsir = 154 - 98 = 56cm² (c) 6. panjang busur AB = <AB/360derajat x kllng lingkaran 22 = x/360 x (2 x 22/7 x 14) 22 = x/360 x 88 22 = 88x/360 7920 = 88x x = 90 jadi besar <APB = 90derajat
= kll lingkaran = 2 x phi x r
44 = 2 x 22/7 x r
44 = 44r/7
308 = 44r
r = 7cm
luas = phi x r x r
22/7 x 7 x 7
154cm² (b)
5. luas seperempat lingkaran = 1/4 x 22/7 x.14 x.14
154cm²
luas segitiga (yg tidak diarsir) = 1/2 x 14 x 14 = 98cm²
luas daerah yg diarsir = 154 - 98 = 56cm² (c)
6. panjang busur AB = <AB/360derajat x kllng lingkaran
22 = x/360 x (2 x 22/7 x 14)
22 = x/360 x 88
22 = 88x/360
7920 = 88x
x = 90
jadi besar <APB = 90derajat