What angles are formed by perpendicular lines

9/10 divide by -3/15 as a mixed number

M.xyz =radians. covert this radian measure to its equivalent measure in degrees.

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work: