Q. In ΔJKL,JL is extended through point L to point M,m∠JKL=(3x+3)∘, m∠LJK=(3x+17)∘, and m∠KLM=(8x−16)∘. Find m∠KLM.Answer:
Understand angles relationship: Understand the relationship between the angles in the problem.In any triangle, the sum of the interior angles is always 180 degrees. Additionally, the exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles.
Set up exterior angle equation: Set up the equation based on the exterior angle theorem.Since angle KLM is an exterior angle to triangle JKL, we have:m/KLM=m/JKL+m/LJKSubstitute the given expressions:(8x−16)=(3x+3)+(3x+17)
Simplify and solve for x: Simplify and solve for x.Combine like terms:8x−16=6x+20Subtract 6x from both sides:2x−16=20Add 16 to both sides:2x=36Divide by 2:x=18
Find angle KLM measure: Find the measure of angle KLM.Now that we have the value of x, we can substitute it back into the expression for m/_KLM:m/_KLM=8x−16m/_KLM=8(18)−16m/_KLM=144−16m/_KLM=128 degrees
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