Question

@mathmale i just did another and want to make sure its right because i was a little confused a bit.

Answer 1

A.

Answer 2

The surface area is found in a manner quite similar to that of the rectangular prism we worked on previously.

Your triangular prism appears to have 3 sides which are identical in size (congruent).
So you need only calculate the area of 1 side and multiply the result by 3.

Then, since the prism has two ends, we'll need to calculate the area of one end and then multiply the result by 2.

There's a bit more of a challenge in finding the aera of the triangular ends. What have you done so far in that direction?

Answer 3

so am wrong? right??

Answer 4

The total surface area of the triangular prism will be A = 2(area of 1 end) + 3(area of 1 side).

Please, let's go through the actual work. Once we've finished that, you'll know right away whether or not "A" is the correct answer. (You know me by now, right? :) )

Answer 5

of course haha

Answer 6

The surface area of one side is (length)*(width) = ( ? )*( ?? )

Answer 7

:)

Answer 8

Hint: the length of one side is 7. From the drawing, what is the width of one side?

Answer 9

the width is 2.6??

Answer 10

@mathmale

Answer 11

kklu: Looking carefully, I see that each of the 3 sides has length 7 and width 3.

That 2.6 is not the width; it's the height of the prism, and also the height of the triangle that forms the end of the prism. OK with that?

Answer 12

So, the area of each of the 3 sides of the prism is (length)*(width) = ( ? )( ? ) = ??

Answer 13

so whats the trianglle base and height??

Answer 14

Look at the triangle in FRONT (nearest to you). One of its sides has been dimensioned. What is the length of that side?

Answer 15

7

Answer 16

KKLU: That "7" represents the LENGTH of the rectangular side. I was asking you for the LENGTH of one side of the triangle.

Answer 17

oh

Answer 18

2.6

Answer 19

that's the HEIGHT of the triangle in back; we will need this quantity.
But what's the LENGTH of the triangle in front? Only one dimension is given, so we' re going to assume that this is an equilateral triangle (with all sides equal).