document.write( "Question 759678: a point (x,y) moves along a circle represented by x^2+y^2=400, but never leaves the first quadrant. At any location, the point determines an angle theta. A horizontal line through the point, a vertical line through the point, and a diameter of the circle determine a triangle.which expression gives the area of the triangle in terms of sin(theta) and cos(theta)? \n" ); document.write( "

Algebra.Com's Answer #462161 by KMST(5398) $\"\"$ $\"About$

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$\"x%5E2%2By%5E2=400\"$ <--> $\"x%5E2%2By%5E2=20%5E2\"$
\n" ); document.write( "is the equation of a circle with radius $\"20\"$ , centered at the origin, O(0,0).
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$\"x=20cos%28theta%29\"$ $\"y=20sin%28theta%29\"$
\n" ); document.write( "The area of right triangle PQR can be calculated as
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