Untuk π = 22\7, hitunglah panjang jari-jari lingkaran yang luasnya sebagai berikut !
a. 44 cm² b.154 cm² c. 2.464 cm²
a. 44 cm² b.154 cm² c. 2.464 cm²
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b 7
c 28
L = πr² = 22/7 .r² = 44 cm²
r² = 44 x 7/22 = 14
r = √14 cm
b = 154 cm²
L = πr² = 22/7.r² = 154 cm²
r² = 154 x7/22 = 49
r = √49 = 7 cm
c= 2.464 cm²
L = πr² = 22/7 .r² = 2.464 cm²
r² = 2.464 x 7/22 = 784
r = √784 = 28 cm