#### Answer

(a) A=cm$^2$
(b) P=6$\frac{1}{2}$ ft
(c) C$\approx$28.5 m
(d) A=307 in$^2$

#### Work Step by Step

(a) Area is always measured in units squared.
(b) Perimeter cannot be measured in feet squared so it must be just feet.
(c) Circumference cannot be measured in meters squared so it must be just meters.
(d) Area is always measured in units squared.