Triangle LMN has vertexes at L(-1, -6), M(1, -6), and N(1, 1). Find the measure of angle N to the nearest degree.
Hint: Sketch the triangle on the coordinate plane and find the side lengths using the Distance Formula first.
A) 74º
B) 18º
C) 72º
D) 16º
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Triangle LMN has vertexes at L(-1, -6), M(1, -6), and N(1, 1). Find the measure of angle N to the nearest degree. Answer D)
I.
¯LM=√[(−1)−(1)]2+[(−6)−(−6)]2=√(−2)2+(0)2=2¯MN=√[(1)−(1)]2+[(−6)−(1)]2=√(0)2+(−7)2=7tan(N)=¯LM¯MN=27N=tan−1(27)=15.9453959009\ensurement∘≈16\ensurement∘
The answer is D)
Triangle LMN has vertexes at L(-1, -6), M(1, -6), and N(1, 1). Find the measure of angle N to the nearest degree.
Let's translate N so that it lies at (0,0)...then L= (-2, -7) and M = (0, -7).....this will make the calculation of the distances easier.......
So NL = √(4 + 49) = √(53)
And NM = √49 = 7
And ML = √4 = 2
And LMN forms a right triangle, with angle NML = 90
So.....using the Law of Sines, we have
NL / sin 90 = ML / sin(LNM)
√(53) = 2/sin(LNM)
sin(LNM) = 2/√(53)
sin-1[2/√(53] = LNM ≈15.945° ≈ 16°