16 square cm
324 square centimeters.
The question does not make any sense since a square cannot have three measures associated with it.
You don't. One measures length, the other measures area.
64 centimeters squared
Area = 27*27 = 729 square cm
A rectangle measuring 1 by 3 meters has an area of 3 square meters. 1 meter = 100 centimeters 1 square meter = 100 x 100 = 10000 square centimeters. 3 square meters = 30000 square centimeters.
Its perimeter is 48 centimeters (4X12=48).
Then the hypotenuse is, in centimeters, the square root of 32 + 62 = 9 + 36 = 45, which is 3 * sqrt(5) cm, or 6.7082039324993690892275210061938 cm.
It is: 1/3*64*3 = 63 cubic cm
We will first convert the sides to centimeters. 12 inches equals 30.48 centimeters. Then, we will square 30.48 (to find the area, you multiply one side by another, or if it is a square [not a rectangle] you square one side, or multiply it by itself) and 30.482 is 929.0304 cm2.
The perimeter of this square measures 4 x 1 = 4 decimeters. As 1 decimeter = 10 centimeters then 4 decimeters = 4 x 10 = 40 centimeters.