Area, Circumference, Area of a Sector and Arc Length of a Circle

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

• A = 2πr

• A = πr^2

• A = 3r^2

• A = 0.5πr^2

Tags

CCSS.7.G.B.4

If the radius of a circle is 5 cm, what is its circumference?

• 20 cm

• 15.70795 cm

• 3.14159 cm

• 31.4159 cm

Tags

CCSS.7.G.B.4

What is the formula to find the area of a sector in a circle?

• (θ/360) * π * r^2

• (θ/360) * 2π * r

• (θ/180) * 2π * r

• (θ/180) * π * r^2

Tags

CCSS.HSG.C.B.5

If the central angle of a sector is 51 degrees in a circle with radius 16 cm, what is the area of the sector?

• 36π cm^2

• 16π cm^2

• 48π cm^2

• 64π cm^2

Tags

CCSS.HSG.C.B.5

What is the formula to calculate the arc length of a circle?

• L = (x*C)/2πr

• L = 2πr

• L = r^2

• L = (x*C)/360

Tags

CCSS.HSG.C.B.5

If the radius of a circle is 10 cm and the central angle is 45 degrees, what is the arc length?

• 39.27π cm

• 8π cm

• 10π cm

• 3π cm

Tags

CCSS.HSG.C.B.5

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

• The diameter is equal to the radius squared.

• The diameter is half of the radius.

• The diameter is less than the radius.

• The diameter is equal to 2 times the radius.

Tags

CCSS.7.G.B.4

If the diameter of a circle is 14 cm, what is its radius?

• 7 cm

• 10 cm

• 8 cm

• 6 cm

Tags

CCSS.7.G.B.4

How is the circumference of a circle related to its diameter?

• C = 2d

• C = d^2

• C = πd

• C = 0.5d

Tags

CCSS.7.G.B.4

If the circumference of a circle is 36π cm, what is its diameter?

• 45 cm

• 72 cm

• 18 cm

• 36 cm

Tags

CCSS.7.G.B.4