The penguin exhibit at a zoo has a raised circular island that is surrounded by water. the diameter of the island is 20 \text{ meters}20 meters20, start text, space, m, e, t, e, r, s, end text. one penguin swims half way around the island before hopping out. how far did the penguin swim?

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.