Around which line would the following cross-section need to be revolved to create a sphere?

y=1

Step-by-step explanation:

we know that

When you will rotate a circle about its diameter, you will obtain a sphere

In this problem

The diameter of the circle pass through the y-axis and pass through the line y=1

so

If the cross section is revolved around the y-axis, then we will obtain a sphere

If the cross section is revolved around the y=1, then we will obtain a sphere

therefore

The answer is

y=1

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"