Find the perimeter and area of a square of side 9 cm .

Options

A. `=86cm^(2)`
B. `=81cm^(2)`
C. `=91cm^(2)`
D. `=71cm^(2)`

Answer

To find the perimeter and area of a square with a side length of 9 cm, we can follow these steps:

### Step 1: Understand the formulas
- The formula for the perimeter (P) of a square is:
\[ P = 4 \times \text{side} \]
- The formula for the area (A) of a square is:
\[ A = \text{side} \times \text{side} \]

### Step 2: Calculate the perimeter
- Given that the side length of the square is 9 cm, we can substitute this value into the perimeter formula:
\[ P = 4 \times 9 \]
- Now, perform the multiplication:
\[ P = 36 \text{ cm} \]

### Step 3: Calculate the area
- Now, we will calculate the area using the area formula:
\[ A = 9 \times 9 \]
- Perform the multiplication:
\[ A = 81 \text{ cm}^2 \]

### Final Answer
- The perimeter of the square is **36 cm**.
- The area of the square is **81 cm²**.

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