Answer:
≈ 20.6 ft
Step-by-step explanation:
the pole, ground and wire form a right triangle with the wire being the hypotenuse.
let the height of the pole be h , then using Pythagoras' identity
h² + 19² = 28²
h² + 361 = 784 ( subtract 361 from both sides )
h²= 423 ( take square root of both sides )
h = [tex]\sqrt{423}[/tex] = 20.566..
then height of pole is approximately 20.6 ft ( to 1 dec. place )
