approximate the length of the hypotenuse to the nearest tenth without adding a calculator

Answer:
hypotenuse=6.4
Step-by-step explanation:
One side is 4 units and the other is 5 units.
Hypotenuse= c^2
a^2+b^2=c^2
5^2+4^2=c^2
25+16=c^2
41=c^2
√41=c
c=6.4