Answer: Right angled at the origin.
- A Obtuse angled
- B Not a valid triangle
- C Right angled at the origin
- D Equilateral
Correct answer: C. Right angled at the origin
Explanation: Two sides lie along the perpendicular x and y axes, so the angle at the origin is 90°.
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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