since a=25 and b=20, the ellipse can be represented by
x^2/25^2 + y^2/20^2 = 1
Now just find 2x when y=10.
An arch is in the form of a semi ellipse.it is 50m wide at the base and has ahight of 20m.how wide is the arch at the height of 10m above the base?
2 answers
25