Use the image to answer the question.

A graph shows quadrant 1 with the x-axis and y-axis ranging from 0 to positive 9, 3,2 and 7,8 are highlighted.

Apply the Pythagorean Theorem to find the length between the two points. Round your answer to the nearest hundredth.

1 answer

To find the distance between the points (3, 2) and (7, 8) using the Pythagorean Theorem, we can use the distance formula, which is derived from the Pythagorean Theorem:

\[ d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \]

Where:

  • \((x_1, y_1)\) = (3, 2)
  • \((x_2, y_2)\) = (7, 8)

Now, we can substitute the coordinates into the formula:

\[ d = \sqrt{(7 - 3)^2 + (8 - 2)^2} \]

Calculating the differences:

\[ d = \sqrt{(4)^2 + (6)^2} \]

Now squaring the differences:

\[ d = \sqrt{16 + 36} \]

\[ d = \sqrt{52} \]

Now we can simplify \(\sqrt{52}\):

\[ d = \sqrt{4 \cdot 13} = 2\sqrt{13} \]

Using a calculator, we approximate \(\sqrt{13}\):

\[ \sqrt{13} \approx 3.60555 \]

Therefore:

\[ d \approx 2 \times 3.60555 \approx 7.2111 \]

Rounding to the nearest hundredth:

\[ d \approx 7.21 \]

Thus, the length between the two points is approximately 7.21.

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