### Home > GB8I > Chapter 7 Unit 8 > Lesson INT1: 7.1.7 > Problem 7-80

7-80.

On graph paper, plot the points and

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*7-80 HW eTool*

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Calculate

(the length of).Use the Pythagorean Theorem to find the length of

.Locate the midpoint of

and label it point. What are the coordinates of point?Use two congruent slope triangles to find the midpoint.

Calculate

. Can you do this without using the Pythagorean Theorem?Because

is the midpoint, what does that tell you about the length of?

Use the hints in the eTool below for parts (a-c).

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