Imagine a circle perfectly inscribed within a square. If the square's side is 10 cm, what is the diameter of the circle?

If you divide a circle into 4 equal parts, what is the angle of each part in degrees?

A circular garden has a radius of 7 meters. What is its approximate circumference (use π ≈ 3)?

Which of these shapes is most similar to a 'heavenly parasol' when viewed from above?

If a parasol has 8 equally spaced ribs, what is the angle between each rib?

The area of a circle is calculated using which formula?

Imagine stacking circular parasols perfectly on top of each other. What shape is formed?

A sector of a circle has an angle of 180 degrees. What fraction of the whole circle is this sector?

Which of these numbers is closest to the value of Pi (π)?

If you fold a circular parasol in half, then in half again, what shape does the folded edge form?