Look at the square below:
What is the area of the square?
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Look at the square below:
What is the area of the square?
The area of the square is equal to the side of the square raised to the second power.
That is:
Since the drawing gives us one side of the square, and in a square all sides are equal, we will solve the area of the square as follows:
Look at the square below:
What is the area of the square?
Area measures space inside the shape, not the distance around it. When you square 9, you're finding how many unit squares fit inside: 9 × 9 = 81 unit squares. Multiplying by 4 gives the perimeter!
means 9 × 9 = 81, while 2 × 9 = 18. The exponent 2 tells you to multiply 9 by itself, not by 2!
Think of it as "side times side" or imagine filling the square with unit squares. A 9×9 grid has 9 rows and 9 columns, so 9 × 9 = 81 total squares.
Yes! Since 9² is a perfect square, you can memorize that 9² = 81. Other perfect squares to remember: 1² = 1, 2² = 4, 3² = 9, 4² = 16, 5² = 25, etc.
The same formula works! . Just be extra careful with decimal multiplication.
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