Saturday, January 07, 2012

Puzzle 22 - Cresents on sides of right triangle


 
ABC is a triangle right angled at C.  Three semicircles are drawn on the sides AB, BC and CA as the respective diameters.  If the sides a, b, c of the triangle are positive integers and the sum of the shaded areas is also to be a positive integer, how many distinct such triangles are there with perimeter at most 60 units?

3 comments:

Ketan Bacchuwar said...

Sir, 9 triangles are possible.

nasser ali said...

the shaded areas lie between 3 semi circles and the circumcircle of triangle which equal(after simplify)1/4(22/7)(a+b)+(1/2)ab.so (a+b)must be the multiple of 7 and even then,(a=6 ,b=8)or (a=12 ,b=16)

Vidyamanohar said...

This question can be independently asked as to find the number of Pythagorean triplets whose sum is less than or equal to sixty. But the idea was to connect the shaded area to the area of the triangle.