Circle Angles B24Fa2
1. The problem involves finding the value of $x$ given angles in a circle, where angles such as $x^\circ$, $2x^\circ$, $3x^\circ$, $-x^\circ$, and $130^\circ$ appear in various configurations.
2. Key circle theorems to use:
- The sum of angles around a point is $360^\circ$.
- Angles in a triangle sum to $180^\circ$.
- Angles subtended by the same arc are equal.
- The angle between a tangent and a chord is equal to the angle in the alternate segment.
3. From the given angles, identify relationships. For example, if angles $x^\circ$, $2x^\circ$, and $3x^\circ$ are parts of a triangle or around a point, their sum must satisfy the relevant theorem.
4. Suppose the angles $x^\circ$, $2x^\circ$, and $3x^\circ$ form a triangle, then:
$$x + 2x + 3x = 180$$
$$6x = 180$$
$$x = 30$$
5. Check consistency with other given angles such as $130^\circ$ and $-x^\circ$ (which means an angle of $-30^\circ$ if $x=30$), ensuring all angle sums and circle theorems hold.
6. Therefore, the value of $x$ is $30^\circ$.
Final answer: $x = 30^\circ$