Geometrymedium · Past Paper
If the area of a circle is numerically equal to its circumference, what is its radius?
A1 unit
B2 units
Cpi units
D4 units
✓ Correct Answer: B — 2 units
pi * r^2 = 2 * pi * r => r^2 = 2r => r = 2.
Share this question
More from Geometry
- The ratio of the corresponding altitudes of two similar triangles is 3:4. What is the ratio of their areas?
- If an equilateral triangle is inscribed in a circle of radius r, what is the side of the triangle?
- Find the equation of the locus of a point which moves such that its distance from the y-axis is twice its distance from the x-axis.
- The point (-3, 4) lies in which quadrant?
- If the altitudes of a triangle are h1, h2, and h3, then the area is given by: