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| Introduction |
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| Every geometric figure has a shape and a size. Two circles of different radii have the same shape but their sizes are different. But if we draw two circles of the same radius both the shape and size will be the same. Such figures with the same shape and size are called congruent figures. We can check whether two figures are congruent or not by the method of superposition. We say that two triangles ABC and DEF are congruent if we can make one triangle fit exactly on the other. |
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In the above figure, the two triangles are congruent and we write  . The sides which are equal in length are called the corresponding sides and the angles which are equal in measure are called the corresponding angles. |
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