The triangle joining the points P(2, 7), Q(4, -1), R(-2, 6) is

Equilateral triangle

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Right-angled triangle

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Isosceles triangle

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Scalene triangle

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Solution

The correct option is B
Right-angled triangle

Since PQ = $\sqrt{68}$ , PR = $\sqrt{17}$ , QR = $\sqrt{85}$

$∴$ $P Q^{2}$ + $P R^{2}$ = $Q R^{2}$ , i.e. right angled triangle.

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