Peny : L = πr2 154 = 22/7 x r2 r2 = 22/7 : 154 r2 = 7/22 x 154 = 49 r = akar 49 = 7cm.
K lingkaran = 2πr = 2 x 22/7 x 7 = 44 cm
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rutherlizabeth
1. Massukkan ke dalam rumus Luas lingkaran L = phi * r² 154 = 22/7 * r² 154 * 7/22 = r² -------> dibalik 22/7 -nya karena pindah luas 49 = r² √49= r² r = 7 d = 14 ----> 2*r Keliling = phi * d K = 22/7 * 14 K = 44
2. Masukkan ke rumus luas . L = π * r² 64π = π * r² 64π/π = r² ----> π pindah ruas maka berubah jadi per. lalu π/π = 1 64 = r² √64 = r r = 8
L = 154 cm2
π = 22/7
Peny :
L = πr2
154 = 22/7 x r2
r2 = 22/7 : 154
r2 = 7/22 x 154 = 49
r = akar 49 = 7cm.
K lingkaran = 2πr
= 2 x 22/7 x 7 = 44 cm
L = phi * r²
154 = 22/7 * r²
154 * 7/22 = r² -------> dibalik 22/7 -nya karena pindah luas
49 = r²
√49= r²
r = 7
d = 14 ----> 2*r
Keliling = phi * d
K = 22/7 * 14
K = 44
2. Masukkan ke rumus luas .
L = π * r²
64π = π * r²
64π/π = r² ----> π pindah ruas maka berubah jadi per. lalu π/π = 1
64 = r²
√64 = r
r = 8