Question

If two sides of triangle is 6cm and 9cm so what will be the measure of the third side?​

Answer 1

Answer:

$using \: pythagoras \: theorem \\ {6}^{2} + {x}^{2} = {9}^{2} \\ 36 \: + {x}^{2} = 81 \\ {x}^{2} = 45 \\ x = \sqrt{45 } \\ x = 3 \sqrt{5}$

hence the measure of third side is 3√5 cm