Geometrymedium · Past Paper
Calculate the value of x if (5x - 5) and (2x + 10) are angles on a straight line.
A15
B25
C35
D45
✓ Correct Answer: B — 25
5x - 5 + 2x + 10 = 180; 7x + 5 = 180; 7x = 175; x = 25.
Share this question
More from Geometry
- The sum of all interior angles of a triangle is:
- If two parallel lines are cut by a transversal, the corresponding angles are:
- In a cyclic quadrilateral ABCD, if angle A = 70 degrees, what is angle C?
- The point of intersection of the altitudes of a triangle is called:
- Find the area of a triangle whose vertices are (0, 0), (4, 0), and (0, 3).