Question

Match each shape with its surface area. Use 3.14 for pi and round to the nearest whole number where necessary.
(match)
1. square pyramid: base length 5 meters, slant height 10 meters
2. cone: radius 6 meters, slant height 8 meters
3. square pyramid: base length 6 meters, slant height 11 meters
4. cone: radius 6 meters, slant height 5 meters



A.264
B.125
C.207
D.168

Answer 1

@tcarroll010

Answer 2

surface area is just the area of each side added together, for the first one, it's just a bunch of triangles multiplied by the base all added together, does that make sense?

Answer 3

KInd of.

Answer 4

Same with a cone: area of cone is \(\pi rs\) ADDED to \(\pi r^2\) which is the area of the base.

Answer 5

Ok.

Answer 6

For square pyramid, you need 1. area of square, 2. area of ONE triangle. BUT notice that there are FOUR triangles in a a square pyramid:

Since there are 4 triangles, the area is 4
but area of a triangle is divided by 2. so you get \(2s^2sl\)

Answer 7

sorry \(s^2+2sl\)

Answer 8

Oh, okay.