How do i do this don’t understand it?

You have to use

so take your 12in in height and use it as your

divide 10 in half to make your base so now your

is 5. now you have to add 12 and 5. this gives you 17. now square root it.

your answer in now. 4.12. since you have 2 triangles in one whole triangle add 4.12 to 4.12 and you get 8.24. your pyramid has 4 triangles so

is 32.98.

10×10 is 100 so add 32.98 to it.

your surface area is 132.98