If m<ABC=m<DBE, than m<CBE=m<ABD
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The theorem that states every triangle's angles add up to 180 degrees
There are no right angles in a square based pyramid, so Pythagoras and his theorem are not involved.
Provided they are not overlapping, there are 20. (Four angles in a square, four times five equals twenty.)
Yes, because of the base angles theorem converse: If two angles in a triangle are congruent, then the sides opposite the angles are congruent.
converse of the alternate exterior angles theorem