radius = 9
Answer:
1017.9 square units
Sphere with radius 9 units
Identify the formula for surface area of a sphere
Square the radius
Multiply by 4π
Final answer
SA = 4πr²
This formula calculates the surface-area of a sphere.
A ball with 9 cm radius has 1017.9 cm² of surface area
A spherical balloon with 9 inch radius = 1017.9 square inches of surface
The surface area of a sphere is a fundamental concept in geometry. Surface area measures the total area of all surfaces of a 3D object, expressed in square units.
By using the formula SA = 4πr², we can quickly and accurately calculate the surface area for any sphere when we know the required measurements.
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