Question

Is the following definition of complementary reversible? If yes, write it as a true biconditional.

Complementary angles are two angles whose sum measures to 90 degrees

a.this statement is not reversible
b.Yes, if angles are complementary, than their sum measures to 90 degrees
c. Yes, angles are complementary if (and only if) their sum measures to 90 degrees
d. Yes, angles are complementary if their sum measures to 90 degrees

Answer 1

Which biconditional is NOT a good definition?

a. A whole number is odd if and only if the number is not divisible by 2.

b. An angle is straight if and only if its measure is 180.

c. A whole number is even if and only if it is divisible by 2.

d. A ray is a bisector of an angle if and only if it splits the angle into two angles.