For ABC, what is the value of cosC?

Question

anonymous · Answer

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A0.5

B. 0.6

C. 0.8

D.0.9

anonymous · Answer

can you show me how to get the answer?

anonymous · Answer

cos c = adjacent side / hypotenuse
         = 72 /90
          = 8 / 10
           = 0.8

anonymous · Answer

can you tell me step by step please

anonymous · Answer

i've tried to do this 
maybe i can explain a little more:

this is a right angled triangle  (angle B is 90 degrees)
and for this type of triangle  the ratio of adjacent side/ longest side ( called the hypotenuse) for a particular angle is always the same.
this ratio is called the cosine

the angle C is 'sitting' on the side of length 72 (adjacent) and hypotenuse = 90
so cos C = 72/90

there 2 other ratios are  the sine = opposite side / hypotenuse
  and tangent = opposite / adjacent

anonymous · Answer

thanks

anonymous · Answer

so for example  sin C = 54/90

anonymous · Answer

yw