alleryThe angles of a triangle are in the ratio 1 : 2 : 3. What kind of triangle is it?
AObtuse triangle
BEquilateral triangle
CAcute triangle
DRight triangle
Answer & Solution
Correct answer: D. Right triangle
1. Let the angles be x, 2x and 3x.
2. x + 2x + 3x = 180 degrees, so 6x = 180 and x = 30 degrees.
3. The angles are 30, 60 and 90 degrees.
4. One angle is 90 degrees, so it is a right triangle.
_Source: Wikipedia, Triangle (CC BY-SA 4.0), Definition, terminology, and types_
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