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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

High School Mathematics - 2
8.6 Circles - Theorems

Statement: If two arcs are congruent, then their chords are equal.
Given: Arc ASB = Arc CTD
To prove: AB = CD

Proof: OA = OlC, OB = OlD (radii)
Angle AOB = Angle COlD (given that the arcs are congruent)
Hence by SAS Postulate on congruence AOB is congruent to COlD
Hence AB = CD

Statement: There is only one circle passing through three non collinear points.

Example: In the given figure prove that AB = CD

Solution: Arc BAD congruent Arc CDA
Hence Arc BAD - Arc AD = Arc CAD - Arc AD
Arc BA is congruent Arc CD
Hence AB = CD

Directions: Solve the following.
Q 1: BC is a chord of circle with centre O. A is a point on the major arc BC as shown, prove that angBAC + angOBC = 90.


Q 2: Find the missing angle.


Q 3: Two congruent circles intersect each other at points P and Q, a line through P meets the circles in A and B. Prove that QA = QB

Q 4: Two diameters of a circle intersect each other at right angles. Prove that the quadrilateral formed by joining their end points is a square.

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Question 6: This question is available to subscribers only!

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