Answer:
BC ≈ 20.9
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
BC² + AC² = AB²
BC² + 7² = 22²
BC² + 49 = 484 ( subtract 49 from both sides )
BC² = 435 ( take the square root of both sides )
BC = [tex]\sqrt{435}[/tex] ≈ 20.9 ( to the nearest tenth )
