Question #297943

Find the value of the cosecant of an angle given that the point on the terminal side of an angle is (3,4)


1
Expert's answer
2022-02-22T00:45:52-0500

Solution:

Using the point (3,4), we can see that this forms a right triangle that has a base that is 3 units in length and an adjoining leg that is 4 units high. We are able to find the hypotenuse of this triangle using the Pythagorean Theorem. This will give us the distance of the point (3,4) to the origin.

So, a=3,b=4a=3,b=4

Using,

a2+b2=c232+42=c2c2=9+16=25c=5a^2+b^2=c^2 \\ \Rightarrow 3^2+4^2=c^2 \\\Rightarrow c^2=9+16=25 \\\Rightarrow c=5

And so the hypotenuse of this triangle (the distance from our point we are working with to the origin), is 5 units long. Recall that when using cosecant for right triangles, cosecant represents the following

cosec=HypotenusePerpendicular=cbcosec=54\cosec=\dfrac{Hypotenuse}{Perpendicular}=\dfrac cb \\\Rightarrow \cosec=\dfrac 54


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