TIGAS QUIZIZZ

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

• A = r²/2

• A = πr²

• A = πd

• A = 2πr

If the radius of a circle is 14 cm, what is the value of π you should use?

• 3.1415

• 3.16

• 3.14

• 3.00

Calculate the area of a circle with a radius of 14 cm using the formula πr².

• 450 cm²

• 200 cm²

• 615.44 cm²

• 615.44 m²

What does the term 'radius' refer to in a circle?

• The radius refers to the distance from the center to the circumference of a circle.

• The radius is the area of the circle divided by its circumference.

• The radius is the diameter of the circle divided by two.

• The radius is the total distance around the circle.

If the radius is doubled, how does it affect the area of the circle?

• The area of the circle increases by a factor of 3.

• The area of the circle decreases by a factor of 2.

• The area of the circle increases by a factor of 4.

• The area of the circle remains the same.

What is the area of a circle with a radius of 7 cm?

• 150.00 cm²

• 153.86 cm²

• 160.00 cm²

• 154.00 cm²

How would you express the area of a circle in square centimeters?

• A = πd square centimeters

• A = r² square centimeters

• A = 2πr square centimeters

• A = πr² square centimeters

If the area of a circle is 616 cm², what is the radius?

• 10 cm

• 14 cm

• 16 cm

• 12 cm

What is the relationship between diameter and radius in a circle?

• The radius is twice the diameter.

• The diameter is half the radius.

• The radius and diameter are equal.

• The diameter is twice the radius.

If you increase the radius of a circle to 21 cm, what will be the new area?

• 1385.44 cm²

• 923.88 cm²

• 314.16 cm²

• 462.84 cm²