The two base angles are congruent or equal measure. Find one angle and use the 180 degree rule and you can find all three.
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An isoseles triangle is when two of the three sides/angles are the same
It can be if the interior angles are 45, 45 and 90 degrees
Yes and its interior angles are 45, 45 and 90 degrees which is a right angle isosceles triangle
Because each triangle will have two equal angles of 45 degrees and one angle of 90 degrees.
11.3 rounded off because of a parallell