To find the perimeter of a square, multiply the side length by :

Quadrilateral ABCD has four ninety-degree angles, which means that it has four right angles because every right angle measures ninety degrees. If a quadrilateral has four right angles, then it must be a rectangle by the definition of a rectangle. This means statement I is definitely true.

However, just because ABCD has four right angles doesn't mean that it is a rhombus. In order for a quadrilateral to be considered a rhombus, it must have four congruent sides. It's possible to have a rectangle whose sides are not all congruent. For example, if a rectangle has a width of 4 meters and a length of 8 meters, then not all of the sides of the rectangle would be congruent. In fact, in a rectangle, only opposite sides need be congruent. This means that ABCD is not necessarily a rhombus, and statement II does not have to be true.

A square is defined as a rhombus with four right angles. In a square, all of the sides must be congruent. In other words, a square is both a rectangle and a rhombus. However, we already established that ABCD doesn't have to be a rhombus. This means that ABCD need not be a square, because, as we said previously, not all of its sides must be congruent. Therefore, statement III isn't necessarily true either.

The only statement that has to be true is statement I.

The answer is I only.

A rhombus is any quadrilateral with four congruent sides. A square is a quadrilateral with four congruent sides and four right angles. A square is also a rhombus.

Rectangles will have two pairs of congruent sides, but not all four sides will be congruent.

The perimeter of a rectangle is the sum of the length of each of the four sides.

Since

substitute each in:

To find perimeter, add up all the sides. In a rectangle, there are 2 sets of identical sides so you can multiply the length by 2 and the width by 2 and combine them to get 36 inches.

Add up all of the sides of the rectangle to get 64 inches. 

To find the perimeter of a rectangle you must find the sum of all of the side lengths.

To do this we plug the base and height into the equation 

With a base of  and a height of  our equation would look like 

Multiply and add the numbers together 

The answer is .

The perimeter of a rectangle is .

Plug in our given information to solve:

The perimeter is the sum of the length of all of the sides. We are given all of the side lengths in the figure, so we simply need to sum them together.

To find the perimeter of a rectangle you must find the sum of all of the side lengths.

To do this, we plug the base and height into the equation .

With a base of  and a height of  our equation becomes .

Multiply and add the numbers together:

The answer is .