No, not all congruent angles are 45 degrees. They only are in complementary congruent angles.
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No. If two angles are congruent they have the same measure. But that measure can be anything.
No. The only requirement for a triangle to be a 45-45-90 triangle is for it to have at least two congruent sides/angles. The measure of the two congruent angles can be anything.
always
vertical angles are always congruent...they are two nonadjacent angles formed by intersecting lines. Vertical angles are congruent..or equal in measure
Opposite angles are congruent in a parallelogram.