Please help A triangle ABC has angle ABC labeled as q, angle BCA labeled as r, and the exterior angle at A labeled as p.

p + r = q
p + q + r = 180 degrees
p + q + r = 90 degrees
q + r = p

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