the point(5/13,Y) IS IN THE 4TH quadrant corresponds to angle on the unit circle

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26-05-2018
Mathematics

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the point(5/13,Y) IS IN THE 4TH quadrant corresponds to angle on the unit circle

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tramserran tramserran · Answer 1 · 2018-05-26T12:41:38+02:00

tramserran tramserran

26-05-2018

4th quadrant is positive x (cos) and negative y (sin)

Use the Pythagorean Theorem to calculate the value of y (sin).
x² + y² = c²
5² + y² = 13²
25 + y² = 169
y² = 144
y = 12

Since the y-value is negative in the 4th quadrant, then y = -12

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