1. **Problem Statement:**
Given a circle centered at the origin and a point on the circle at coordinates $(10, 24)$, find:
a) $\sin(\theta)$ where $\theta$ is the angle between the positive x-axis and the radius to the point.
b) The measure of angle $w$ in degrees.
c) The measure of angle $\theta$ in degrees.
2. **Formula and Important Rules:**
- The radius $r$ of the circle is the distance from the origin to the point $(10, 24)$, calculated by the distance formula:
$$r = \sqrt{x^2 + y^2}$$
- The sine of angle $\theta$ in a right triangle is the ratio of the opposite side to the hypotenuse:
$$\sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}}$$
- The angle $w$ is complementary to $\theta$ in the right triangle, so:
$$m\angle w = 90^\circ - m\angle \theta$$
3. **Calculate the radius $r$:**
$$r = \sqrt{10^2 + 24^2} = \sqrt{100 + 576} = \sqrt{676} = 26$$
4. **Calculate $\sin(\theta)$:**
The opposite side to $\theta$ is the y-coordinate 24, and the hypotenuse is $r=26$:
$$\sin(\theta) = \frac{24}{26} = \frac{\cancel{24}}{\cancel{26}} = \frac{12}{13}$$
5. **Calculate $m\angle \theta$ in degrees:**
Use the inverse sine function:
$$m\angle \theta = \sin^{-1}\left(\frac{12}{13}\right) \approx 67.38^\circ$$
6. **Calculate $m\angle w$ in degrees:**
Since $w$ and $\theta$ are complementary:
$$m\angle w = 90^\circ - 67.38^\circ = 22.62^\circ$$
**Final answers:**
- a) $\sin(\theta) = \frac{12}{13}$
- b) $m\angle w = 22.6$ deg (rounded to one decimal place)
- c) $m\angle \theta = 67.4$ deg (rounded to one decimal place)
Circle Triangle Angles C85273
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