What is the measure of the radius of the circle inscribed in a triangle whose sides measure 4, 11 and 12 units?
Choose the correct choice from the following options.
A) 1.6 units	B) 6 units	C) 3 units	D) 5 units	E) 12 units

Rationale: sides are 4 , 11 and 12 . . . thus it is right angle triangle since 12 ^ 2 = 4 ^ 2 + 11 ^ 2 therefore , area = 1 / 2 * 11 * 4 = 22 we have to find in - radius therefore , area of triangle = s * r . . . . where s = semi - perimeter and r = in - radius now s = semi - perimeter = 12 + 11 + 4 / 2 = 13,5 thus , 22 = 13,5 * r and hence r = in - radius = 1.6 option a
Answer: A