Calculate Square Perimeter: Given Area = 3²√16 Square Units

Square Geometry with Exponential Expressions

Given the area of the square ABCD is

3216 3^2\sqrt{16}

Find the perimeter.

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine the perimeter of the square
00:03 In a square, all sides are equal
00:08 We'll use the formula for calculating square area (side squared)
00:15 Substitute in the appropriate values and solve for A
00:18 Calculate the power and the root
00:27 Extract the root to isolate side A
00:33 This is the length of the square's side
00:40 In a square all sides are equal, therefore the perimeter equals 4 times A
00:44 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given the area of the square ABCD is

3216 3^2\sqrt{16}

Find the perimeter.

2

Step-by-step solution

To find the perimeter of the square ABCD, we first need to determine the side length of the square using the given area. The area of a square is calculated using the formula: Area=s2 \text{Area} = s^2 , where s s is the side length of the square.

According to the problem, the area of the square is given by the expression 3216 3^2\sqrt{16} .

Let's simplify this expression:

  • First, calculate 32 3^2 , which is 9 9 .

  • Next, calculate 16 \sqrt{16} , which is 4 4 .

Now, multiply these results: 9×4=36 9 \times 4 = 36 .

Thus, the area of the square is 36 36 .

Since the area is s2=36 s^2 = 36 , we can solve for s s :

  • Find the square root of both sides: s=36 s = \sqrt{36} .

  • This gives s=6 s = 6 .

Now that we have the side length s=6 s = 6 , we can find the perimeter. The perimeter P P of a square is given by:

P=4s P = 4s .

Substituting the side length, we get:

  • P=4×6=24 P = 4 \times 6 = 24 .

The solution to the question is: 24 24

3

Final Answer

24 24

Key Points to Remember

Essential concepts to master this topic
  • Area Formula: For squares, Area = s² where s is side length
  • Technique: Simplify 3216=9×4=36 3^2\sqrt{16} = 9 \times 4 = 36 first
  • Check: Verify s = 6 gives Area = 36, then P = 4(6) = 24 ✓

Common Mistakes

Avoid these frequent errors
  • Using area formula for perimeter calculation
    Don't use P = 4 × Area = 4 × 36 = 144! This treats area as side length, giving a massively wrong perimeter. Always find the side length first by taking the square root of the area, then multiply by 4.

Practice Quiz

Test your knowledge with interactive questions

\( 5+\sqrt{36}-1= \)

FAQ

Everything you need to know about this question

Why do I need to simplify the area expression first?

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You must simplify 3216 3^2\sqrt{16} to get a clear numerical value for the area. Without simplifying, you can't easily find the square root to get the side length!

How do I know which square root to take?

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Since we're finding a side length, we always take the positive square root. Side lengths can't be negative in geometry!

What if I can't simplify the square root easily?

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For this problem, 36=6 \sqrt{36} = 6 is a perfect square. If you get non-perfect squares, use a calculator or leave it in radical form like 50 \sqrt{50} .

Can I work backwards from the answer choices?

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Yes! If the perimeter is 24, then each side is 24÷4=6 24 ÷ 4 = 6 . Check: Area = 62=36 6^2 = 36 , which matches 3216=36 3^2\sqrt{16} = 36

Why are the other answer choices wrong?

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Let's check: 232=16 2^3 \cdot 2 = 16 , 24=16 2^4 = 16 , and 42=16 4^2 = 16 . All give perimeter 16, meaning side length 4 and area 42=1636 4^2 = 16 ≠ 36 .

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