If the angles of a triangle are in the ratio 1:1:2, the triangle is a/an:
Answer: C
Let the angles be x, x, and 2x.
Sum of angles = x + x + 2x = 180°
4x = 180°
x = 45°
The angles are 45°, 45°, and 2x = 90°.
Since two angles are equal (45°), the triangle is isosceles.
Since one angle is 90°, the triangle is right-angled.