It’s 10m. If you know about Pythagorean triples, one of the triplets is 6,8,10. The other way is the Pythagorean Theron which is a^2 +b^2=c^2. So if we plug it in it would be 6m^2+8m ^2=am^2. So 6m^2+8m ^2 would be equal to 100m^2. Then you would have to find the square root of it to get 10m.