Surface Area of a Sphere

Find the surface area of a sphere with radius $3$. Use π ≈ $3.14$.

• 1Square the radius: $3^2=9$
• 2Multiply by π: $3.14\times 9=28.26$
• 3Multiply by $4$: $28.26\times 4$

Answer: $113.04$

Find the surface area of a sphere with radius $7$. Use π ≈ $3.14$.

• 1Square the radius: $7^2=49$
• 2Multiply by π: $3.14\times 49=153.86$
• 3Multiply by $4$: $153.86\times 4$

Answer: $615.44$