Let C1 and C2 be two circles that touch externally at point P. Let AB be a direct common tangent to C1 and C2, where A and B are the points of tangency on C1 and C2 respectively. If ∠PAB = 50°, then find the measure of ∠ABP.

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?