2) Select all of the statements that are true concerning the measures of a circle.
a. The circumference of a circle with a radius of 1 unit is equal to pi square units.
b. The area of a circle with a diameter of 1 unit is equal to pi square units.
c. The circumference of a circle with a radius of 1 unit is equal to pi units.
d. The circumference of a circle with a diameter of 1 unit is equal to pi units.
e. The value pi represents the constant of proportionality that gives the circumference of a
circle, if you know its diameter.
f. The value pi represents the constant of proportionality that gives the area of a circle, if
you know its diameter.