Question

What is the surface area of a triangular pyramid if each face has an area of 30 mm2?

A.
60 mm2

B.
160 mm2

C.
120 mm2

D.
90 mm2

Answer 1

@campbell_st

Answer 2

@mathstudent55

Answer 3

@ignaris

Answer 4

help

Answer 5

This is a similar problem only the solid is different.
How many face are there in a triangular pyramid?

Answer 6

3

Answer 7

4

Answer 8

Sorry. The problem is the other way around.
You know the area of one face. You want the area of all faces, so this is a multiplication problem.
The question now is what do you multiply by?
How many faces are there in a triangular pyramid?
4, you are correct, so multiply 30 mm^2 by 4

Answer 9

so 240

Answer 10

???
What is 30 * 4 ?

Answer 11

120

Answer 12

Btw, 240 is not even a choice

Answer 13

Correct. 120 mm^2 is the answer

Answer 14

sorry thanks

Answer 15

No problem.