radius = 20
Answer:
5026.5 square units
Sphere with radius 20 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 20 cm radius has 5026.5 cm² of surface area
A spherical balloon with 20 inch radius = 5026.5 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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