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
- What is the slope (gradient) of the line passing through (1, 2) and (3, 8)?
- The equation x^2 + y^2 + 2gx + 2fy + c = 0 represents a circle. Its radius is given by:
- Which of the following is always true for the orthocenter of an obtuse triangle?
- The area of a triangle with vertices (1, 2), (1, 2), and (3, 4) is:
- If (1, 2), (4, y), (x, 6), and (3, 5) are vertices of a parallelogram taken in order, then x and y are: