Which of these shapes is congruent? Young geometers examine five familiar shapes: triangle, oval, rectangle, triangle, and circle. Each is followed by a set of shapes, of which one is congruent. They circle the congruent shape. Consider encouraging kids to verbalize what they have done here, asking why they didn't circle one of the other shapes. What makes this objective more solid, is that some of the congruent shapes are oriented differently, showing scholars this attribute doesn't matter when it comes to congruence.