Geometryhard · Past Paper
Calculate the sum of the interior angles of a decagon.
A1080 degrees
B1260 degrees
C1440 degrees
D1800 degrees
✓ Correct Answer: C — 1440 degrees
(10-2)*180 = 8*180 = 1440 degrees.
Share this question
More from Geometry
- Find the area of the ring between two concentric circles whose circumferences are 88 cm and 66 cm.
- The lines representing x^2 - y^2 = 0 pass through which point?
- The perpendicular from the center of a circle to a chord ____ the chord.
- If a line y = mx + c is a tangent to the circle x^2 + y^2 = a^2, then c is equal to:
- Find the area of the largest triangle that can be inscribed in a semi-circle of radius r.