The Pythagorean theorem tells you the square of the hypotenuse is equal to the sum of the squares of the sides.
BC² = AB² + AC²
BC² = 4² +4² = 32
BC = √32 = 4√2
BC = 4*1.41 = 5.64
The length of segment BC is 5.64 m.
I'm pretty sure it depends what kind of triangle it is
If you paid attention in math, you would know this lol jk.
But you would rewrite it as 5+4
