Answer:
28.28
Step-by-step explanation:
Using Pythagoras' identity on the right triangle
d² = 20² + 20² ← Pythagoras' identity
= 400 + 400 = 800 ( take the square root of both sides )
d = [tex]\sqrt{800}[/tex] ≈ 28.28 ( to 2 dec. places )
