Use the distance formula and the following definitions to classify ΔABC. A(2, -6), B(7, -1), C(-2, 3)?
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multiple choice
A. ΔABC is equilateral.
B. ΔABC is scalene.
C. ΔABC is right.
D. ΔABC is isosceles.
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Distance between two points is sq rt [(x2-x1)² + (y2-y1)²]
You will find that BC has the length sq rt[9² + 4²]
And AC has the length sq rt [4² + 9²]
Therefore two sides of the triangle have the same length, so D is the answer.