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r = √49
r = 7 cm
Keliling = 2 . 22/7 . 7 = 44 cm
154 cm² = 22 x r²
7
1078 cm² = 22 x r²
1078 cm² = 22r²
r² = 1078
22
r² = 49
r = √ 49
r = 7 cm
Keliling = 2 x π x r
= 2 x 22 x 7
7
= 2 x 22
= 44 cm