In the figure, sides MN, NL and LM of ΔLMN touch a circle at the points A, B and C respectively. If AN = 5 cm, CL = 4 cm and CM = 6 cm, then the perimeter of ΔLMN is :

1. 30 cm

2. 45 cm

3. 60 cm

4. 15 cm

In the figure, two circles touch each other at X. YZ and PX are common tangents to these circles. If YP = 3.8 cm, then YZ = ?

1. 1.9 cm

2. 11.4 cm

3. 7.6 cm

4. 7 cm

In the given figure, RT is a tangent touching the circle at S. If ∠PST = 30° and ∠SPQ = 60°, then ∠PSQ is :

1. 40°

2. 30°

3. 60°

4. 90°

In the given figure, O is the centre of the circle and AB is a chord. If the tangent AM at A makes an angle of 50° with AB, then ∠AOB = ?

1. 100°

2. 75°

3. 80°

4. 150°