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The problem you’ve uploaded involves some mathematical calculations related to a semicircular area and trees to be planted around it. Let me help you break it down.

### Given Information:
1. The area is semicircular with a diameter of 20 meters.
2. The radius of the semicircle is 10 meters.
3. There is an area reserved for a 12-meter radius garden within this semicircle.
4. Trees are to be planted around the semicircular park at intervals of 2 meters.

### Questions Analysis:
- **Question 4** asks for the number of trees needed to be planted at 2-meter intervals around the park.
- **Question 5** deals with calculating the cost of paving the semicircular park.
- **Question 6** is about the cost of installing lamps around the semicircular park.

### **Question 4: Number of Trees**
To calculate the number of trees to be planted around the semicircular park, we need to find the perimeter of the semicircle:
1. **Perimeter of the semicircle** = \( \pi r + 2r \), where \( r = 10 \) meters.

   - \( \pi r = \pi \times 10 = 31.4 \) meters (approximately)
   - \( 2r = 20 \) meters

   So, the total perimeter = \( 31.4 + 20 = 51.4 \) meters.

2. **Number of trees** needed = \( \frac{51.4}{2} = 25.7 \), so approximately 26 trees (since the question specifies planting trees at intervals of 2 meters).

### **Question 5: Cost of Paving**
For this question, the area of the semicircle must be calculated and then multiplied by the given cost per square meter:
1. **Area of the semicircle** = \( \frac{1}{2} \times \pi r^2 \)
   - \( \frac{1}{2} \times \pi \times (10)^2 = 157 \) square meters (approximately).

   Cost = Area \( \times \) cost per square meter.

### **Question 6: Cost of Lamps**
This will involve calculating the total perimeter of the park and multiplying it by the cost per meter to install the lamps.

Would you like the full details of the calculations for these questions? If you need more specific answers for any of these questions, let me know!

Jika di sekitar taman tersebut akan ditanami pohon pauak merah dengan jarak antar pohon 2 meter, hitung berapa banyak pohon pauak merah yang diperlukan.

Learn how to calculate the number of trees required to be planted around a semicircular park at 2-meter intervals. This problem involves geometric concepts and the perimeter formula, suitable for students in Grades 7-9.

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