What is the base and the height of the triangle?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

True or false? a circle could be circumscribed about the quadrilateral below.