Question

find the surface area of this cylinder. use 3.14 for π. do not round your answer. 4 cm 9 cm what is the area of both circles? both circles: ?cm²

Explanation:

Step1: Recall area formula for one - circle

The formula for the area of a circle is $a = \pi r^{2}$, where $r = 4$ cm and $\pi=3.14$.

Step2: Calculate area of one - circle

$a_1=3.14\times4^{2}=3.14\times16 = 50.24$ $cm^{2}$

Step3: Calculate area of two circles

Since there are two circular bases in a cylinder, the area of both circles $A = 2\times a_1$.
$A = 2\times50.24=100.48$ $cm^{2}$

Answer:

$100.48$ $cm^{2}$