Geometryhard · Past Paper
A regular polygon has an interior angle of 144 degrees. How many sides does it have?
A8
B10
C12
D15
✓ Correct Answer: B — 10
Ext angle = 180 - 144 = 36. n = 360 / 36 = 10 sides.
Share this question
More from Geometry
- What is the sum of the exterior angles of a triangle (one at each vertex)?
- If the lines 2x + y - 3 = 0 and kx + 2y - 1 = 0 are parallel, find k.
- Which congruence criterion uses three sides of one triangle and three sides of another?
- The length of a transverse common tangent to two circles of radii 8 cm and 2 cm with centers 13 cm apart is:
- Calculate the area of a triangle with base 10 units and height 5 units.