The image shows a square inscribed within a circle with the label "Keliling" which means "perimeter" in Indonesian. The side length of the square is given as 20 units. The task appears to be finding the perimeter (keliling) of the square or possibly the circumference of the circle.

Let's solve both parts for clarity:

1. Perimeter of the Square:

   • The perimeter $P$ of a square is given by $P = 4 \times \text{side length}$.
   • Here, the side length = 20 units.
   • $P = 4 \times 20 = 80$ units.

2. Circumference of the Circle:

   • Since the square is inscribed in the circle, the diameter of the circle is equal to the diagonal of the square.
   • The diagonal $d$ of a square with side length $s$ is given by $d = s\sqrt{2}$.
   • Here, $s = 20$ units, so $d = 20\sqrt{2}$.
   • The circumference $C$ of a circle is given by $C = \pi \times \text{diameter}$.
   • $C = \pi \times 20\sqrt{2} \approx 88.83$ units.

Summary

• Perimeter of the square: $80$ units.
• Circumference of the circle: Approximately $88.83$ units.

Would you like to know more details or have any questions about this problem?

Related Questions:

1. What is the area of the square with a side length of 20 units?
2. How do you calculate the diagonal of a square?
3. What is the area of the circle inscribed around a square with a side length of 20 units?
4. How is the radius of the circle related to the side length of the square?
5. How do you find the circumference of a circle given its diameter?

Tip:

When dealing with a square inscribed in a circle, remember that the circle's diameter is the diagonal of the square.