# If the cosines of the two of the angles of a triangle are proportional to the oppsite sides show that the trangle is right angled.?

##### 2 Answers

Aug 13, 2018

Such

#### Explanation:

#sin ( A - B ) = sinA cos B - cos A sin B = 0.So.

Aug 13, 2018

If we consider that the cosines of the two of the angles of a triangle are **inversely proportional** to the opposite sides then we can get the expected result. Let for

Hence