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Verified answer
A.Luas = 1/4 × 22/7 × 7² = 1/4 × 154 = 38,5 cm²
b. L = 1/4 × 22/7 × 28 = 1/4 × 2464 = 616 cm²
Verified answer
A. diameter = 7
jari" = 3.5
π = 3.14
luas = πr^2
3.14 × 3.5^2
3.14×12.25
38,465
38.5
B.diameter = 28
jari" = 14
π = 22/7
luas = πr^2
22/7 ×14^2
22/7 × 196
22×28
=616