A special right triangle drawn in Quadrant I intersects the unit circle at point (x,y)

where y=2√2
. What is the value of x in point (x,y)
? Use the equation of the unit circle to determine the missing coordinate.

1 answer

The equation of the unit circle is given by:

\[ x^2 + y^2 = 1 \]

In this case, we know \( y = 2\sqrt{2} \). To find the value of \( x \), we can substitute \( y \) into the equation of the unit circle:

\[ x^2 + (2\sqrt{2})^2 = 1 \]

Calculating \( (2\sqrt{2})^2 \):

\[ (2\sqrt{2})^2 = 4 \cdot 2 = 8 \]

So we substitute this back into the equation:

\[ x^2 + 8 = 1 \]

Now, we can isolate \( x^2 \):

\[ x^2 = 1 - 8 \]

\[ x^2 = -7 \]

Since \( x^2 = -7 \) is not possible for real numbers, it indicates that the point \( (x, y) \) with \( y = 2\sqrt{2} \) does not intersect the unit circle.

Thus, there is no value of \( x \) for point \( (x, y) \) on the unit circle corresponding to \( y = 2\sqrt{2} \) in Quadrant I.