High School

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In △KLM, overline KM is extended through point M to point N.

Given:
- \( m∠MKL = (3x + 19)° \)
- \( m∠LMN = (7x + 5)° \)
- \( m∠KLM = (2x + 8)° \)

What is the value of \( x \)?

Answer :

Final answer:

The value of x in triangle KLM is found to be 11 degrees by applying the exterior angle theorem.

Explanation:

To find the value of x in triangle KLM, where angle LMN is an exterior angle, we use the fact that the exterior angle theorem states that an exterior angle is equal to the sum of the two non-adjacent interior angles. Therefore:

m∠LMN = m∠MKL + m∠KLM

(7x + 5)° = (3x + 19)° + (2x + 8)°

Combine like terms:

7x + 5 = 3x + 19 + 2x + 8

7x + 5 = 5x + 27

Solve for x:

7x - 5x = 27 - 5

2x = 22

x = 11

Thus, the value of x is 11 degrees.

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