Question

|I didn't find it! HELP!|
Find the Surface area of the space figure.
>(^.^)<

Answer 1

it looks like each face is a triangle.
what is the formula for the area of a triangle?

Answer 2

It's a Triangular Pyramid but I can't remember that formula to that one, do you know it?

Answer 3

yes, it is a pyramid, but it is a square pyramid

It has 4 sides and a bottom.
so find the area of the pyramid, find the area of each side and the area of the bottom

first step: what is the formula for the area of a triangle ?

Answer 4

this gives the formula for lots of shapes
http://www.mathsisfun.com/area.html

Answer 5

Area for a triangle is = ½ × b × h ?

Answer 6

@phi sorry for taking so long.

Answer 7

yes, 1/2 *base*altitude (or height)

they give you the base and the altitude, so you can find the area of one triangular face
what is it ?

Answer 8

42! ?

Answer 9

wait! 1/2 of 42?
21!?

Answer 10

you need the base , and the height. multiply times each other, then divide by 2

Answer 11

so, 1/2 x (the slant) height (42), times that, then divide by 2 ?

Answer 12

either multiply by 1/2 or divide by 2 but not both

multiplying by 1/2 is the same as dividing by 2.

you know the height is 42
what is the base of the triangle ?

Answer 13

21 ?

Answer 14

the "base" is the bottom edge of the triangle.

Answer 15

I'm so sorry, and feel really stupid right now, but. Can you tell me what the base is of the bottom edge of the triangle

Answer 16

look at your picture. they label the length of the bottom side (and the altitude also)

Answer 17

45 ?

Answer 18

yes. If we laid the triangle flat, it would look like this