Do the base angles in an isosceles right triangle always measure 45°45°?
a.) Yes, the base angles of any isosceles triangle are congruent and supplementary, so their measures must be 45°45°.
b.) yes, the base angles of a right isosceles triangle are congruent and complementary, so their measures must be (fraction) 90°/2 = 45°
c.) No, the base angles of a right isosceles triangle are not always congruent.
d.) No, the base angles of a right isosceles triangle are congruent, but they can both equal 90°90°.