
In given figure, PQ is a side of a regular hexagon and PR is the side of a regular octagon inscribed in a circle with centre O. Calculate the measures of



Important Questions on Circles
A sector of radius and central angle is rolled up into a cone. What is the central angle of the sector to be used to make a cone of base radius and height ?

The length of two chords and of a circle of centre are equal and then, is

Only one circle can be drawn through three non collinear points.

In the given figure, is the diameter of a circle and then is equal to

In the given figure, is a pentagon inscribed in a circle such that is a diameter and side . If , find giving reason .

Prove that, the angle in the semicircle is right angle.

is the diameter of the circle. is the point on the circle.
. The measure of one among and is . Write the measures of .



The angle subtended by the diameter of a circle at a point on the circumference is _____.


In the given figure is centre of a circle, and then the value of will be

On the circle with center , points are such that . A point is located on the tangent at to the circle such that and are on the opposite sides of the line and . The line segment intersects the circle again at . Then the ratio is equal to -

In figure if , then is equal to

In the figure, the chord is perpendicular to the diameter . Find the measure of . (in ).


In the figure given below is the centre of the circle. If the and angle . Find the value of giving reasons.

In the given figure and are two tangents to the circle with centre , touching at and respectively. If and , find

In the figure, is the centre of a circle, is a diameter. If , then find the measure of (in ).



