Answer:
The straight line distance from your starting point to your end point is 29 miles.
Explanation:
Connecting your starting point and your end point will create a triangle
Use Pythagorean Theorem to find the missing length
20² + 21² = x² Simplify the left side of the equation
400 + 441 = x² Combine like terms
841 = x² Take the square root of both sides
29 = x