Question

PLEASE I NEED HELP!!!! What is the type of two-dimensional solid created by a vertical cross section of the cone that passes through the apex? What is the area of the cross section?

triangle; area = 45 ft2

triangle; area = 90 ft2

circle; area = 36π ft2

circle; area = 144π ft2

Answer 1

B

Explanation:

correct on ed2020

Answer 2

triangle; area = 90 ft2

Explanation:

THe type of two dimensional solid created by a vertical cross section of the cone that passes through the apex is a triangle, as you can see in the picture, if you draw a line that cuts the cone in half passing through the apex it would just be a triangle, and the area of the cross section is given by the formula:

`a=(b*h)/(2)`

Since you have the radius of the base of the cone, you need the diameter to calculate the area, the diameter is given by the next formula:

`D=2r`

`D=2(6)`

`D=12`

Now you just put your values into the formula of the triangle:

`a=((12)(15))/(2)`

`a=((180)/(2)`

`a=90`

So the area of the triangle formed is:

`90ft^(2)`