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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 POQ

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Important Questions on Circles

EASY

A sector of radius 12 centimetres and central angle 120° is rolled up into a cone. What is the central angle of the sector to be used to make a cone of base radius 2 centimetres and height 4 centimetres?

MEDIUM

The length of two chords AB and CD of a circle of centre O are equal and AOB=60° then, COD is

EASY

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

MEDIUM

In the given figure, BC is the diameter of a circle and BAO=60° then ADC is equal to

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MEDIUM

In the given figure, ABCDE is a pentagon inscribed in a circle such that AC is a diameter and side BCAE. If BAC=50°, find giving reason EDC.

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EASY

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

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AB is the diameter of the circle. D is the point on the circle.

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ACB+ADB+AEB=270°. The measure of one among ACB, ADB and AEB is 110° . Write the measures of ACB, ADB, AEB.

EASY
A, B and C are three points on a circle such that the angles subtended by the chords AB and AC at the centre O are 80° and 120°, respectively. The value of BAC is:
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EASY

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

EASY
Two circles intersect each other at the points P and Q. If the diameters of the two circles are PA and PB respectively, then prove that A, Q, B are collinear.
MEDIUM

In the given figure O is centre of a circle, AOB = 40° and BDC = 100° then the value of OBC will be

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HARD

On the circle with center O, points A,B are such that OA = AB. A point C is located on the tangent at B to the circle such that A and C are on the opposite sides of the line OB and AB=BC. The line segment AC intersects the circle again at F. Then the ratio BOF:BOC is equal to -

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MEDIUM

In figure if OAB=40°, then ACB is equal to

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EASY

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

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HARD
Two chords AB and CD of a circle with centre O intersect each other at P. If APC=95° and AOD =110°, then BOC is:
MEDIUM

In the figure given below O is the centre of the circle. If the QR=OP and angle ORP=20°. Find the value of x giving reasons.

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EASY

In the given figure TP and TQ are two tangents to the circle with centre O, touching at A and C respectively. If BCQ=55° and BAP=60°, findAOC.

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EASY

In the figure, O is the centre of a circle, AC is a diameter. If ACB = 50°, then find the measure of BAC(in °).

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MEDIUM
Let A, B, C be three points on a circle of radius 1 such that ACB=π4. Then the length of the side AB is
MEDIUM
In an acute-angled triangle ABC, the altitudes from A, B, C when extended intersect the circumcircle again at points A1, B1, C1 respectively. If ABC=45°, then A1B1C1 equals