Lesson: Geometry - 11t01

Finding The Side Length Of A Triangle

[Page 11 of 30]

See if you can find the length of the side labeled x in the diagram below. Select an answer and then click Continue.

3
5
17
19
22

Countinue

The length of side x must be greater than the difference of the other two sides and less than the sum of the other two sides.

We know that x is greater than 12 - 7 and that x is less than 12 + 7. We can write this as 12 - 7 < x < 12 + 7, or 5 < x < 19. Only Choice (3), 17, meets this requirement, so it is the correct answer.

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