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π × r² = 1386
22/7 × r² = 1386
r² = 1386 : 22/7
r² = 1386 × 7/22
r = √441
r = 21 cm
K = 2 × π × r
K = 2 × 22/7 × 21 cm
K = 132 cm
1386 = 22/7 r²
r²= 1386/22/7
r²=1386 x 7/22
r² = 9702/22
r²= 441
r = √441
r = 21 cm
K = 2πr
= 2 x 22/7 x 21
= 132 cm