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Mathematics 9 Online
OpenStudy (anonymous):

Medal anyone??? sin Θ =15/17 . find cosΘ .

jimthompson5910 (jim_thompson5910):

Draw a right triangle with angle theta |dw:1399857804955:dw|

jimthompson5910 (jim_thompson5910):

sine is opposite/hypotenuse so when they say sin Θ =15/17, they mean the opposite side is 15 and the hypotenuse is 17 |dw:1399857872169:dw|

OpenStudy (anonymous):

a2 + b2 = c2

jimthompson5910 (jim_thompson5910):

what is the value of x?

OpenStudy (anonymous):

but im lost from there

jimthompson5910 (jim_thompson5910):

yeah you'd use the pythagorean theorem

jimthompson5910 (jim_thompson5910):

a = 15 b = x c = 17 a^2 + b^2 = c^2 15^2 + x^2 = 17^2 solve for x

OpenStudy (anonymous):

so is the answer 8?

jimthompson5910 (jim_thompson5910):

x = 8, yes not the final answer though

jimthompson5910 (jim_thompson5910):

|dw:1399858082139:dw|

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