Correct Answer : A
In triangle DEF shown below, points A, B, and C are taken on DE, DF and EF respectively such that EC = AC and CF = BC. If angle D = 40 degrees, then what is angle ACB in degrees?
The sum of the areas of two circles which touch each other externally is 153π, If the sum of their radii is 15, find the ratio of the larger to the smaller radius
Euclid has a triangle in mind. Its longest side has length 20 and another of its sides has length 10. Its area is 80. What is the exact length of its third side ?