Geometrymedium · Past Paper
If the perimeter of a semi-circular protractor is 36 cm, find its diameter. (pi = 22/7)
A7 cm
B14 cm
C21 cm
D28 cm
✓ Correct Answer: B — 14 cm
Perimeter = pi*r + 2r = r(22/7 + 2) = r(36/7) = 36. So r = 7, diameter = 14 cm.
Share this question
More from Geometry
- What is the distance of point (x, y) from the y-axis?
- If the measure of an angle is 1/6 of its reflex angle, find the angle.
- The points (k, 2-2k), (1-k, 2k), and (-4-k, 6-2k) are collinear if k is:
- The center of the circle x^2 + y^2 - 4x + 6y - 12 = 0 is:
- What is the slope of a line which is perpendicular to the Y-axis?