Is a triangle with the sides of 10cm, 41 cm and 42cm right angled

You can check using the Pythagorean Theorem: a^2+b^2=c^
a=10
b=41
c=42 (because it is longest)

10^2+41^2=42^2
100+1681=1764
1781=1764

Since they are not equal, this is not a right triangle

Hope this helps

Your answer should be 1/3. i hope i could ! good luck : )