Trigonometry and Surds
I have a problem solving question which has been frustrating me:
A triangle has sides of lengths √6, 3√2 and 3√3 units.
Is the triangle right angled? You must give a reason for your answer.
Any help would be greatly appreciated, thank you.
1) Use Pythagoras Theorem - if the sum of the squares of the two shorter sides equals the square of the longest side then it is a right angled triangle. (in other words does )
Originally Posted by OJW
2) Use the cos rule to find an angle - if it's 90 degrees then it's a right angled triangle
Thank you very much, that's a perfect explanation!
Originally Posted by e^(i*pi)