https://file.aiquickdraw.com/mathbot/file/1730952831422jitf4tx1.jpg

https://file.aiquickdraw.com/mathbot/file/17309528314261eix70nm.jpg

tolong jawab diketahui ditanya dijawab yaaa

Sure, I’ll help solve the problems from the uploaded images using the structure "diketahui" (given), "ditanya" (asked), and "jawab" (solution). Let's go through each visible question.

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### Image 1

#### Problem 8:
- **Diketahui:**
  - Sudut pusat lingkaran = \(60^\circ\)
  - Jari-jari lingkaran = 21 cm
- **Ditanya:** Panjang busur lingkaran
- **Jawab:**
  - Rumus panjang busur lingkaran: \[ L = \frac{\theta}{360^\circ} \times 2 \pi r \]
  - Substitute values: \[ L = \frac{60^\circ}{360^\circ} \times 2 \pi \times 21 \]
  - Simplify: \[ L = \frac{1}{6} \times 2 \pi \times 21 = 22 \text{ cm} \]
  - **Jawaban:** E. 22 cm

#### Problem 9:
- **Diketahui:**
  - Jari-jari lingkaran = 3 m
- **Ditanya:** Panjang garis putih yang membentuk lingkaran (keliling)
- **Jawab:**
  - Rumus keliling lingkaran: \[ K = 2 \pi r \]
  - Substitute values: \[ K = 2 \pi \times 3 = 6 \pi \approx 18.8 \text{ m} \]
  - **Jawaban:** D. 18.8 m

#### Problem 10:
- **Diketahui:**
  - Sudut pusat \( \angle PTR = 120^\circ \)
- **Ditanya:** Nilai \( \beta \)
- **Jawab:**
  - Karena sudut pusat adalah \(120^\circ\), maka sudut keliling yang bersesuaian (\( \beta \)) adalah setengah dari sudut pusat.
  - \[ \beta = \frac{120^\circ}{2} = 60^\circ \]
  - **Jawaban:** E. 60°

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### Image 2

#### Problem 4:
- **Diketahui:**
  - Jari-jari lingkaran = 21 cm
  - Sudut pusat \( \angle ACB = 120^\circ \)
- **Ditanya:** Panjang busur \( \text{ACB} \)
- **Jawab:**
  - Rumus panjang busur: \[ L = \frac{\theta}{360^\circ} \times 2 \pi r \]
  - Substitute values: \[ L = \frac{120^\circ}{360^\circ} \times 2 \pi \times 21 \]
  - Simplify: \[ L = \frac{1}{3} \times 2 \pi \times 21 = 44 \text{ cm} \]
  - **Jawaban:** B. 44 cm

#### Problem 5:
- **Diketahui:**
  - Jari-jari lingkaran \( M = 7 \) cm
  - Panjang busur \( PQ = 9.6 \) cm
- **Ditanya:** Besar sudut \( PMQ \)
- **Jawab:**
  - Rumus panjang busur lingkaran: \[ L = \frac{\theta}{360^\circ} \times 2 \pi r \]
  - Substitute values and solve for \( \theta \): \[ 9.6 = \frac{\theta}{360^\circ} \times 2 \pi \times 7 \]
  - Simplify: \[ \theta = \frac{9.6 \times 360^\circ}{2 \pi \times 7} \approx 78^\circ \]
  - **Jawaban:** D. 80°

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If you need further assistance or if you have questions about other specific problems on the page, please let me know. Here are some related questions for practice:

1. What would be the length of an arc if the radius is doubled but the central angle remains the same?
2. How do you calculate the circumference of a circle with a radius of 10 cm?
3. If the radius is halved, how does the length of the arc change for a fixed angle?
4. What formula relates the area of a sector to its central angle?
5. How would you find the angle if only the arc length and radius are given?

**Tip:** Remember, when calculating the length of an arc, it’s helpful to convert the angle to radians for simpler calculations in more advanced math contexts.

Learn how to solve various geometry problems related to circles, including calculating arc lengths, circumferences, and angle measures. This guide includes step-by-step solutions for students in Grade 8, covering essential geometry concepts and theorems.

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