Question

the radius r of a sphere is 7.3 mm. calculate the spheres surface area a. use the value 3.14 for π, and round your answer to the nearest tenth.

Explanation:

Step1: Recall the surface - area formula

The formula for the surface area of a sphere is $A = 4\pi R^{2}$.

Step2: Substitute the given values

Given $R = 7.3$ mm and $\pi=3.14$, we substitute into the formula: $A = 4\times3.14\times(7.3)^{2}$.
First, calculate $(7.3)^{2}=7.3\times7.3 = 53.29$.
Then, $4\times3.14\times53.29=4\times167.3306 = 669.3224$.

Step3: Round the result

Rounding 669.3224 to the nearest tenth gives 669.3.

Answer:

$669.3$