Exploring Area and Circumference of Circles and Sectors

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

• 2πr^2

• 2πr

• πr^2

• πd

How do you calculate the circumference of a circle?

• 2πr

• πr^2

• πd

• r^2

What is the area of a circle with a radius of 5cm?

• 25π cm^2

• 10π cm^2

• 5π cm^2

• 15π cm^2

How is the circumference formula also represented?

• πd

• r^2

• 2πr

• πr^2

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

• Diameter is half of the radius

• Radius is half of the diameter

• Diameter is double the radius

• Radius is equal to the diameter

What does the sector of a circle represent?

• A full circle

• The center of the circle

• Half of the circle

• A portion of the circle formed by two radii

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

• 49π cm^2

• 14π cm^2

• 7π cm^2

• 21π cm^2

How do you calculate the area of a sector with a 100-degree angle in a circle of radius 7cm?

• 49π/360

• 100π/360

• 4900π/360

• 360π/100

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

• 21π cm

• 28π cm

• 7π cm

• 14π cm

How do you find the length of the arc of a sector with a 100-degree angle in a circle of radius 7cm?

• 100π/360

• 7π * (100/360)

• 14π * (100/360)

• 49π * (100/360)