Question

How do I find the surface area? there is like, Two width's :/

Answer 1

the surface are of this triangular prism is made up of four faces
two of the faces are rectangles and the tother two are identical triangles ,
find the surface area of each face and add them together

Answer 2

area*

Answer 3

just a= perimeter times hieght

Answer 4

and perimeter = a+b+c and height is given 13

Answer 5

No, I believe the height is 8.

Answer 6

in case of triangle 8 is the perpendicular but since it is a triangular prism the height is 13

Answer 7

For any prism, area of the bases * 2 + Lateral areas.

Answer 8

Area of the bases: These are triangles, h*b /2 = (8 * 15) /2 = 60

There's two; 60*2 = 120

Answer 9

Lateral: 13*17 + 13*15 + 8 *15 = 536

120+536=656

Answer 10

there are 3 rectangular sides, and 2 triangle sides
I assume you know how to find the area of a rectangle?
their dimensions (from the picture) are:
13 x 17
13 x 15
8 x 13

the triangles are congruent with base and altitude of 15 and 8
together their area is 120.

Now add up all the areas to get the total surface area.