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Question

Which of the following information are needed to draw a unique ΔABC?


A

Length of AB and AC only

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B

Length of AB, AC and BC

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C

A, B and C

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D

AB, BC and C

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Solution

The correct option is B

Length of AB, AC and BC


We need three measurements to construct a triangle. The lengths of sides AB, AC and BC are required to draw a unique ΔABC (SSS criterion). With the set of measurements of three angles, we can construct infinite triangles (AAA is not a congruence criterion). Similarly, two angles and excluded angle will not give a unique triangle (SSA is not a congruence criterion).


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