Two pyramids like the one below sit on top of the gates at the entrance to the bridge. A square pyramid. The base is 10 inches by 10 inches. The triangular sides have a base of 10 inches and height of 13 inches. The pyramid has a height of 12 inches.

Which expression shows how to determine the minimum amount of cement used to make each of the pyramids?

A. One-third (10) (10) (12)

B. One-half (10) (10) (12)

C. 4 (one-half (10) (13)) + 10 (10)

D. 4 (one-third (10) (13)) + 10 (10)

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle