see this pic and solve in notebook step by step
for my exam fast
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surface area of sphere = 4πr^2
154 cm^2. = 4×22/7×r^2
154 × 7/22×4. = r^2
1078/88. = r^2
√12•25. = r
3.5 cm. =r
154 cm^2. = 4×22/7×r^2
154 × 7/22×4. = r^2
1078/88. = r^2
√12•25. = r
3.5 cm. =r
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