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Show which angle is 90° in triangle ABC with A(4, 4), B(3, 5) and C(−1, 1).

Class 10Classifying Shapes by CoordinatesGeometry — Coordinates

AAngle A
BAngle C
CNo angle is 90°
DAngle B

Step-by-Step Solution

A B^{2} = 1 + 1 = 2, B C^{2} = 16 + 16 = 32, A C^{2} = 25 + 9 = 34.2 + 32 = 34

, so

A C

is the hypotenuse and the right angle is at

B

.

Answer: D) Angle B

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