Choose the triangle in which angle 2 is not an exterior angle.
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The sum of two numbers is 12 and their difference is 18 what are the two numbers

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).