How do i simplify 4 over 12 times 8 over 20

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

What are the excluded values? m+5/mn+3m

50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 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: