For the three circles with centers A, B and C and radii 5 cm, 2 cm and 6 cm respectively.

Assertion (A) : To find the perimeter of the triangle ABC, add the radii of given three circles.

Reason (R) : The required perimeter is the product of sum of radii by 2.

1. A is true, R is true

2. A is true, R is false

3. A is false, R is true

4. A is false, R is false

Prove that, of any two chords of a circle, the greater chord is nearer to the centre.

In the given figure, AB is tangent to the circle with center O. If OCB is a straight line segment, the angle BAC is :

1. 40°

2. 55°

3. 35°

4. 20°

In the given figure O is center, PQ is tangent at point A. BD is diameter and ∠AOD = 84° then angle QAD is :

1. 32°

2. 84°

3. 48°

4. 42°