Quantitative Aptitude - Arithmetic Ability Questions

The number of diagonals in a hendecagon is

In a circle with centre O, AB is a diameter and CD is a chord which is equal to the radius OC. AC and BD are extended in such a way that they intersect each other at a point P, exterior to the circle. The measure of ∠APB is

Select the odd word/letters/number/number pair from the given alternatives.

In the following pair of words, pick the odd pair which is odd from the others?

If four angles of a quadrilateral are (6x-18), (80-4x), (4x+14), (12x-58), then find the value of the smallest angle of the quadrilateral.

The surface area of a sphere is 5544 sq.cm. Find its diameter (in cm).

Dodecahedron has 30 edges. How many vertices does it have?