Geometrymedium · Past Paper
The angles of a triangle are in the ratio 1:2:3. What type of triangle is it?
AEquilateral
BIsosceles
CRight-angled
DObtuse-angled
✓ Correct Answer: C — Right-angled
x + 2x + 3x = 180; 6x = 180; x = 30. Angles are 30, 60, 90. One angle is 90, so it is right-angled.
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