Geometryhard · Past Paper
An arc of length 20 cm subtends an angle of 2 radians at the center. What is the radius of the circle?
A5 cm
B10 cm
C20 cm
D40 cm
✓ Correct Answer: B — 10 cm
Arc length s = r * theta (in radians). 20 = r * 2 => r = 10 cm.
Share this question
More from Geometry
- The coordinates of the centroid of a triangle with vertices (x1, y1), (x2, y2), and (x3, y3) is:
- A line passes through (2, 2) and is perpendicular to y = x. Its equation is:
- The ratio of the area of a circle to the area of its circumscribed square is:
- How many common tangents do two circles have if they intersect at two points?
- The longest side of a right-angled triangle is called the: