Which type of angle do construction workers use when building to make sure that the walls and floors of a building are perpendicular?

I took this test and here are the right answers the ones above are wrong

1.obtuse
2.right
3.100 degrees
4.28 degrees
5.TRS

1.) B

2.) C
3.) B
4.) D
5.) A
100%

the answers are

1. B
2. C
3. B
4. D
5. A
Thx Ariana

A Right Angle

Thank you ariana, B,C,B,D,A are correct

I can state the answers from the two people above are correct. I got 100%,thank

THOSE ARE CORRECT ^^^

Ariana is right thx!! 100%

thnx ariana you guys are the best

THANKS ARRIANA UR THE BEST