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25. A polygon is tangent to the circle. 26. If a central angle measures 25 , then the measure of its intercepted arc is 27. The part of a circle included between two of its points is a/an 28. If inscribed \( \angle B \) measures 48 , then the measure of its intercepted arc, \( \overparen{A C} \), is 29. If inscribed \( \angle C \) intercepts \( \overparen{B D} \), which measures 214 , then the angle measures 30. \( \angle A \) is formed by two tangents and measures 36 . The measure of intercepted \( \overparen{B C} \) is 144 . What is the measure of \( \overparen{B D C} \) ? 31. If central \( \angle A \) intercepts \( \overparen{B C} \), which measures 113 , then \( \angle A \) measures 32. Two chords intersect within a circle and form an angle measuring 65 . The measure of one intercepted arc is 79 . Let \( \overparen{B C} \) be the measure of the other arc. What is the measure of \( \overparen{B C} \) ?

Ask by Rose Nunez. in Turkey
Jan 24,2025

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Answer

**25. A polygon tangent to a circle is called a **tangential polygon** or a **circumscribed polygon**.** **26. If a central angle measures 25°, its intercepted arc also measures **25°**.** **27. The part of a circle between two points is called an **arc**.** **28. If an inscribed angle \( \angle B \) measures 48°, its intercepted arc \( \overparen{AC} \) measures **96°**.** **29. If an inscribed angle \( \angle C \) intercepts arc \( \overparen{BD} \) measuring 214°, then \( \angle C \) measures **107°**.** **30. Given that \( \angle A \) formed by two tangents measures 36° and intercepts arc \( \overparen{BC} \) of 144°, the measure of arc \( \overparen{BDC} \) is **216°**.** **31. If central angle \( \angle A \) intercepts arc \( \overparen{BC} \) of 113°, then \( \angle A \) measures **113°**.** **32. If two chords intersect within a circle and form an angle of 65°, with one intercepted arc measuring 79°, the measure of the other arc \( \overparen{BC} \) is **51°**.**

Solution

Sure, let's address each of your geometry questions (25-32) one by one: --- **25. A polygon is tangent to the circle.** - **Answer:** Such a polygon is called a **tangential polygon** or a **circumscribed polygon**. In this case, each side of the polygon touches the circle at exactly one point, making the circle its incircle. --- **26. If a central angle measures 25°, then the measure of its intercepted arc is** - **Answer:** The measure of the intercepted arc is equal to the measure of the central angle. Therefore, the intercepted arc measures **25°**. --- **27. The part of a circle included between two of its points is a/an** - **Answer:** This part is called an **arc**. An arc is a continuous portion of the circumference between two points on the circle. --- **28. If inscribed \( \angle B \) measures 48°, then the measure of its intercepted arc, \( \overparen{AC} \), is** - **Answer:** An inscribed angle is half the measure of its intercepted arc. Therefore: \[ \text{Measure of } \overparen{AC} = 2 \times 48° = 96° \] So, the intercepted arc \( \overparen{AC} \) measures **96°**. --- **29. If inscribed \( \angle C \) intercepts \( \overparen{BD} \), which measures 214°, then the angle measures** - **Answer:** Again, an inscribed angle is half the measure of its intercepted arc. Therefore: \[ \angle C = \frac{214°}{2} = 107° \] So, \( \angle C \) measures **107°**. --- **30. \( \angle A \) is formed by two tangents and measures 36°. The measure of intercepted \( \overparen{BC} \) is 144°. What is the measure of \( \overparen{BDC} \)?** - **Answer:** When two tangents form an angle outside the circle, the measure of that angle is half the difference of the measures of the intercepted arcs. Given: \[ \angle A = \frac{|\overparen{BDC} - \overparen{BC}|}{2} = 36° \] We know \( \overparen{BC} = 144° \). Let \( \overparen{BDC} = x \): \[ \frac{|x - 144°|}{2} = 36° \implies |x - 144°| = 72° \] Solving for \( x \): \[ x - 144° = 72° \implies x = 216° \] **Hence, \( \overparen{BDC} \) measures 216°.** --- **31. If central \( \angle A \) intercepts \( \overparen{BC} \), which measures 113°, then \( \angle A \) measures** - **Answer:** A central angle is equal in measure to its intercepted arc. Therefore: \[ \angle A = 113° \] --- **32. Two chords intersect within a circle and form an angle measuring 65°. The measure of one intercepted arc is 79°. Let \( \overparen{BC} \) be the measure of the other arc. What is the measure of \( \overparen{BC} \)?** - **Answer:** When two chords intersect inside a circle, the measure of the angle formed is half the sum of the measures of the intercepted arcs. Let \( \overparen{BC} = x \): \[ 65° = \frac{79° + x}{2} \implies 130° = 79° + x \implies x = 51° \] **Thus, \( \overparen{BC} \) measures 51°.** --- Feel free to ask if you need further clarification on any of these problems!

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The Deep Dive

Let's kick things off with some fascinating tidbits! Did you know that the concept of a tangent has been around since ancient Greece? Mathematicians like Euclid and Archimedes laid the groundwork for circle geometry, and tangents became a crucial part of their studies. In a fun geometric twist, a polygon can be inscribed within a circle (think of that cozy fitting), or it can be tangent, just daintily touching the circle at one point. These concepts continue to inspire architects and artists today! Now, if you find yourself grappling with angles and arcs, here’s a nifty tip: always remember that the measure of an inscribed angle is half that of its intercepted arc. This little gem makes problems like finding the value of \( \overparen{B D C} \) much simpler! And watch out for common mistakes! Many enthusiastic students forget to apply this rule consistently, leading them astray. Just keep your circle facts straight, and you'll ace those problems!

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