Anewly planted tree needs to be staked with three wires. each wire is attached to the trunk 3ft. above the ground, and then anchored to the ground 4ft. from the base of the tree. how much wire is needed for 6 trees?

So 3 feet up
4 feet away
this is makes a wire that is streached and the ground, tree and wire make a triangle
wire=longest side=hypotonuse
assuming that the angle made by the tree and the ground is a right angle
we have a right triangle with missing hypotonuse

so we use pythagorean theroerm where
a^2+b^2=c^2
a and b are legs
c=hypotonuse
we know that the legs are 3 and 4
subsitute
3^2+4^2=c^2
9+16=c^2
25=c^2
square root boht isdes
5=c
answer is 5 feet per tree
6 trees
5 times 6=30
30 feet needed