Geometryhard · Past Paper
If an angle is double its supplement and half its reflex angle, what is the angle?
A60 degrees
B90 degrees
C120 degrees
D150 degrees
✓ Correct Answer: C — 120 degrees
Angle x = 2(180-x) gives 3x=360, x=120. Check reflex: 360-120=240, and 120 is half of 240. Correct.
Share this question
More from Geometry
- If a line is parallel to the x-axis, its equation is of the form:
- If a line y = mx + c is a tangent to the circle x^2 + y^2 = a^2, then c is equal to:
- In an isosceles triangle, if the vertex angle is 80 degrees, find each base angle.
- If the vertices of a triangle are (0,0), (2,0), and (0,2), find its centroid.
- In a cyclic quadrilateral ABCD, if angle A - angle C = 60 degrees, find angle C.