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22/7 x r² = 154
r² = 154 x 7/22
r=√49= 7 cm
Kliling = 2nr = 2 x 22/7 x 7 = 44cm
L = 154 cm
maka :
L = π x r²
154 = 22/7 x r²
r² = 154x7 / 22
r = √49
r = 7 cm
jadi :
K = 2 x 22/7 x r
= 2 x 22/7 x 7
= 44 cm