Question

Surface area of a triangle.

Answer 1

Surface area is for 3D
You have two angles, you need a side

Answer 2

Other given measurements: the circle is cut into 8 slices. Those angles are the interior angles and the diameter of the pizza is 15''.

Answer 3

@telliott99

Answer 4

I don't see any pizza.

Answer 5

Every triangle is exactly the same.

Answer 6

So we have a pizza in 8 parts. Now what is the question?

Answer 7

I need to figure the surface area of 1 of them.

Answer 8

Well, suppose the radius is r. Then the area is ___. and the area of each piece is 1/8 __.

Answer 9

Ok. Now how do I find the area? I know R = 7.5.

Answer 10

Do you know the formula pi r^2 = A

Answer 11

No I didnt, but that would make the area of 1 triangle 56.25?

Answer 12

>>> r = 7.5
>>> pi * r * r
176.71458676442586
>>> pi * r * r / 8.0
22.089323345553233

I get 22.1, but I might have made an arithmetic mistake.

Answer 13

oops i overlooked pi. Alright so the area of 1 triangle is 22.1 correct?

Answer 14

@telliott99

Answer 15

We match.

Answer 16

So the same concept can be used to figure the surface area if i switch the angles to 45deg?

Answer 17

The interior angles in this pizza are 45.
Also its an area, a surface area is for a solid.

Answer 18

Im sorry I mean 60 degrees. and Alright maybe my teacher messed up then. She said to fine the surface area of the pizza. Thanks for the help though; now to finish the rest of my prject

Answer 19

Yep. In 2D we are talking area. For a solid like a sphere we are talking surface area.

Answer 20

With a 60 degree angle there are 6 slices.

Answer 21

Thank you, appreciate your time.