If the sides are close together, its acute.
The properties 1‚ 2‚ 4‚ and 5. are used
Answer: 
Required theorem:
Pythagorean theorem = 
In other words, one side length squared + another side length squared = the middle lined squared.
Step-by-step explanation:

We can only have a positive distance so your final answer is :

Answer:
Step-by-step explanation:
To the nearest 1d.p=3.9
To the nearest hundredth=3.87