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The problem is about an equilateral triangle \(ABC\) inscribed in a circle with a radius of 8 cm. We are tasked with finding the length of the side of the triangle.

### Key Concepts:
1. **Inscribed Equilateral Triangle**: For an equilateral triangle inscribed in a circle, the relationship between the side of the triangle \( s \) and the radius \( R \) of the circle is given by the formula:
   \[
   s = R \times \sqrt{3}
   \]
2. **Given Data**: The radius of the circle \( R = 8 \, \text{cm} \).

### Solution:
Using the formula for the side length of an equilateral triangle inscribed in a circle:
\[
s = R \times \sqrt{3}
\]
Substitute \( R = 8 \, \text{cm} \):
\[
s = 8 \times \sqrt{3} \, \text{cm}
\]
Thus, the side length of the triangle is \( 8\sqrt{3} \, \text{cm} \).

### Correct Answer:
The correct option is **B. 8√3 cm**.

Would you like more details or have any questions? Here are 5 related questions to explore this further:

1. How would the formula for the side of the triangle change if it was not equilateral but another type of triangle?
2. Can you derive the formula \( s = R \times \sqrt{3} \) for an equilateral triangle inscribed in a circle?
3. What would be the area of the equilateral triangle given the side length \( s \)?
4. How does the central angle of the circle relate to the angles of the inscribed equilateral triangle?
5. If the circle had a radius of 10 cm, what would the side length of the inscribed equilateral triangle be?

**Tip**: Always remember that an equilateral triangle inscribed in a circle has its center coinciding with the center of the circle, making it symmetric and ideal for using geometric relations with the radius.

Suatu segitiga ABC sama sisi dilukis dalam lingkaran yang berjari-jari 8 cm, seperti pada gambar dibawah ini. Panjang sisi segitiga tersebut adalah…

Learn how to calculate the side length of an equilateral triangle inscribed in a circle with a radius of 8 cm. This problem explores the relationship between the radius of a circle and the side of the triangle, using the formula s = R × √3. Ideal for students in Grades 10-12.

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