On a recent trip to Recife, Brazil, we saw a lot of old churches still standing since the early colonization of Brazil by the Portuguese. This picture of the church, shows both an obtuse (left) and acute (right) isosceles triangle. These triangles form the roofs of the church. The roof on the left is an obtuse isosceles because the two sloping sides are congruent and the vertex that is created by those sides is obtuse (greater than 90 degrees). The right roof is an acute isosceles because the two congruent sides form an acute angle (less than 90 degrees).
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