congruent
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Small question: does congruent mean the angles of a shape are the same as another or is it that one shape is the same as another or is it that one shape is proportionally the same as another?
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Also for C2 isn't half of r 3? Then why is it 6?
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And why do we divide by 2 if it's a quadrilateral?
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@TSS-Graviser Congruent means that two shapes have the same angles and the same side lengths, so that they could be stacked on top of each other like post-it notes, to fit exactly.