lingkaran kelas 6

What is the formula to calculate the area of a circle?

• A = πd

• A = r²/2

• A = 2πr

• A = πr²

If the radius of a circle is 7 cm, what is its area? (Use π = 3.14)

• 160.00 cm²

• 153.86 cm²

• 154.00 cm²

• 150.00 cm²

Calculate the circumference of a circle with a radius of 5 cm. (Use π = 3.14)

• 31.4 cm

• 15.7 cm

• 25.0 cm

• 40.0 cm

If the area of a circle is 78.5 cm², what is the radius? (Use π = 3.14)

• 4 cm

• 6 cm

• 7 cm

• 5 cm

What is the value of π used in most calculations?

• 3.14

• 3.0

• 3.141

• 3.15

A circle has a diameter of 10 cm. What is its radius?

• 3 cm

• 7 cm

• 5 cm

• 10 cm

If the radius of a circle is doubled, how does the area change?

• The area increases by a factor of 3.

• The area increases by a factor of 4.

• The area remains the same.

• The area decreases by a factor of 2.

Calculate the area of a circle with a radius of 3 m. (Use π = 3.14)

• 28.00 m²

• 30.14 m²

• 25.12 m²

• 28.26 m²

What is the circumference of a circle with a diameter of 12 cm? (Use π = 3.14)

• 40.00 cm

• 37.68 cm

• 25.12 cm

• 31.42 cm

If the radius of a circle is 4 inches, what is its circumference? (Use π = 3.14)

• 25.12 inches

• 12.56 inches

• 18.84 inches

• 31.40 inches