Hitunglah panjang jari-jari jika luas lingkaran : a.314cm² (=3,14) b.1.386cm² (=22) 7 c.2.826cm² (=3,14) d.2.464cm² (=22) 7
karsihnuraeni
A. L = vhi x r^2 314 = 3,14 x r^2 r^2 = 314 : 3,14 = 100 r = akar 100 = 10 cm b.1386 = 22 x r^2 7 r^2 = 1386 : 22 = 441 7 r = akar 441 = 21 cm c.2826 = 3,14 x r^2 r^2 = 2826 : 3,14 = 900 r = akar 900 = 30 cm d.2464 = 22 x r^2 7 r^2 = 2464 : 22 = 784 7 r = akar 784 = 28 cm
314 = 3,14 x r^2
r^2 = 314 : 3,14 = 100
r = akar 100 = 10 cm
b.1386 = 22 x r^2
7
r^2 = 1386 : 22 = 441
7
r = akar 441 = 21 cm
c.2826 = 3,14 x r^2
r^2 = 2826 : 3,14 = 900
r = akar 900 = 30 cm
d.2464 = 22 x r^2
7
r^2 = 2464 : 22 = 784
7
r = akar 784 = 28 cm
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