Math help! Urgent! ?

Question

When two planes intersect, consecutive dihedral angles are....what?

complimentary, supplementary, obtuse or equal. please and thank you!

Answer 1

they add up to 180 degrees ... I forget the definitions

supplementary "add up to 180"

complementary "add up to 90"  <== note the "e" in "complEmentary"

http://www.algebralab.org/lessons/lesson...

Answer 2

supplementary

Answer 3

supplementary.  try visualizing it.  use your hands! remember that complimentary angles add up to 90 degrees and supplementary angles add up to 180 degrees.