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616= 22/7×r^2
r^2 = 616:22/7
r^2= 616×7/22
r^2= 196 cm^2
r. = √196
r= 14 cm
d= 2× r
= 2× 14
=28 cm
1386= 22/7 × r^2
r^2= 1386 : 22/7
= 1386 × 7/22
= 441 cm ^2
r = √441
r = 21 cm
d= 2 × r
d= 2 × 21 cm
d= 42 cm