Ste7pp2XJericmissama Ste7pp2XJericmissama

15-08-2016
Mathematics

contestada

For an angle Θ with the point (-5, -12) on its terminating side, what is the value of cosine?
a. -5
b. -12
c. -5/13
d. -12/13

Respuesta :

HomertheGenius HomertheGenius

17-08-2016

cos ( theta ) = Adjacent / Hypotenuse
c² = a² + b² = 5 ² + 12² = 25 + 144 = 169
c = √ 169 = 13
Angle theta is in the 3rd quadrant.
cos ( theta ) = - 5/13 ≈ - 0.3846

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