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= 22/7 x 21 ^2
= 1386 cm^2
b. L = phi x r^2
= 22/7 x 70^2
= 15400 cm^2
a=21 cm
maka luas ling = 22/7 * 21 * 21 = 1386 cm2
b=70 cm
kerjakan dengan cara yang sama ya... sebagai latihan