Find the surface area of the figure. Best answer will get the brainiest

Given:

The base of the triangle = 5 mm

The height of the triangle = 7 mm

The height of the prism = 12 mm

The other two sides of the triangle are = 9 mm and 9 mm

To find the surface area of the triangular prism.

Formula

The surface area of the triangular prism is

Where,

b be the base of the triangle

H be the height of the prism

h be the height o the triangle

are the sides of the triangle.

Now,

Putting, b=5, h=7, H=12, we get,

sq mm

or, sq mm

or, sq mm

Hence,

The surface area of the given prism is 311 sq mm.

answer: the answer is d