i need 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

triangle; area = 90 ft2

Step-by-step 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:

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:

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

So the area of the triangle formed is:

step-by-step explanation: