Question

Diameter of sphere is 28 cm. Find out its surface area ?

• A. 2464 cm²
• B. 11498 cm²
• C. 2490 cm²
• D. 2260 cm²

Answer 1

The Correct Option is A

To find the surface area of a sphere, we use the formula:

S = 4πr²

where S is the surface area and r is the radius of the sphere.

Given that the diameter of the sphere is 28 cm, we can find the radius by dividing the diameter by 2:

r = 28 cm / 2 = 14 cm

Now, substitute the radius into the surface area formula:

S = 4π(14 cm)²

S = 4π(196 cm²)

S = 784π cm²

Approximating π as 3.14, we calculate:

S ≈ 784 × 3.14 cm²

S ≈ 2461.76 cm²

Rounding this to the nearest whole number, we get:

S ≈ 2464 cm²

Therefore, the surface area of the sphere is 2464 cm².