auliadwiwulan
1. a) 2[ x r 2 x 3,14 x 2,1 = 6,28 x 2,1 = 13,188 cm b) x d = 3,14 x 1 = 3,14 cm 2. A) x r² = 3,14 x 20² =3,14 x 400 =1256 cm² B) r = 1/2 x d = 1/2 x 3,5 = 1,75 Luas Lingkaran = x r² 3,14 x 1,75² 3,14 x 3,0625 9,61625 cm² 3. B ) 120/ 360 = luas juring/ luas lingkaran 1/3 = luas juring / x r² luas juring = 1/3 x 22/7 x 7 x 7 = 1/3 x 154 = 51 cm² 4. 40°/150° = 32/ busur BC busur BC = 150 x 32 ÷ 40 = 4800 ÷ 40 = 120 cm
2 x 3,14 x 2,1
= 6,28 x 2,1
= 13,188 cm
b) x d
= 3,14 x 1
= 3,14 cm
2. A) x r²
= 3,14 x 20²
=3,14 x 400
=1256 cm²
B) r = 1/2 x d
= 1/2 x 3,5
= 1,75
Luas Lingkaran = x r²
3,14 x 1,75²
3,14 x 3,0625
9,61625 cm²
3. B ) 120/ 360 = luas juring/ luas lingkaran
1/3 = luas juring / x r²
luas juring = 1/3 x 22/7 x 7 x 7
= 1/3 x 154
= 51 cm²
4. 40°/150° = 32/ busur BC
busur BC = 150 x 32 ÷ 40
= 4800 ÷ 40
= 120 cm
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