Toru rode his bike from his house to the library, to the park, and then back home. Toru realized that his route made an isosceles triangle, and that the library was the exact same distance from both his house and the park. What is the measure of the angle at the library?

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit