Self Learning Lingkaran

What is the relationship between the diameter (d) and the radius (r) of a circle?

• d = r + 2

• d = r / 2

• d = 2r

• d = r²

What does Pi (π) represent in relation to a circle?

• The area of the circle.

• The ratio of a circle's circumference to its diameter.

• The radius squared.

• The distance from the center to the edge.

A circle has a radius of 5 cm. Using π ≈ 3.14, what is its circumference?

• 15.7 cm

• 31.4 cm

• 78.5 cm

• 50.24 cm

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A circle has a diameter of 12 cm. Using π ≈ 3.14, what is its area?

• 37.68 cm²

• 50.24 cm²

• 113.04 cm²

• 75.36 cm²

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