1. A seven-sided figure is called:
(A) Square
(B) Octagon
(C) Heptagon
(D) Pentagon
2. If ‘a’ is the side of a polygon of n sides, then its area is:
(A) (n a² / 4) cot(180°/n)
(B) (n a² / 3) (180°/n)
(C) (n a² / 2) sin(360°/n)
(D) None of these
3. Area of a regular polygon of n sides whose radius of circumscribed circle is “R” is:
(A) (nR² / 2) sin(360°/n)
(B) (nR² / n) sin(360°/n)
(C) (R² / 2) cot(180°/n)
(D) None of these
4. Decagon have number of sides:
(A) 8
(B) 9
(C) 10
(D) 12
5. Area of a regular hexagon of side “a” is:
(A) a² / 4
(B) 2√2 a²
(C) (3√3 / 2) a²
(D) 2√3 a²
6. The perimeter of a regular hexagon is 12 cm, its area is:
(A) 10.932 sq. cm
(B) 10.392 sq. cm
(C) 10.239 sq. cm
(D) 10.329 sq. cm
7. Each angle of an octagon is:
(A) 60°
(B) 120°
(C) 135°
(D) 150°
8. Area of regular octagon of side “a” is:
(A) 4.2884 a²
(B) 4.24884 a²
(C) 4.8284 a²
(D) 4.1884 a²
9. A regular polygon having infinite number of sides is called:
(A) Octagon
(B) Hexagon
(C) Circle
(D) Heptagon
10. Area of regular hexagon circumscribed about a circle of radius 2 cm is:
(A) 24√3
(B) 20√3
(C) 36√3
(D) 2√3