Circle Geometry

What is the equation of a circle?

• (x + h)^2 + (y - k)^2 = r^2

• x^2 + y^2 = r^2

• (x - h)^2 + (y - k)^2 = r^2

• (x + h)^2 + (y + k)^2 = r^2

Tags

CCSS.HSG.GPE.A.1

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

• A = πd

• A = πr^2

• A = πr

• A = 2πr

Tags

CCSS.HSG.GMD.A.1

What is the formula to find the circumference of a circle?

• πr

• π/2r

• r/2π

• 2πr

Tags

CCSS.HSG.GMD.A.1

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

• 10π cm^2

• 25π cm^2

• 15π cm^2

• 20π cm^2

Tags

CCSS.HSG.GMD.A.1

If the diameter of a circle is 12 cm, what is its circumference?

• 36π cm

• 24π cm

• 6π cm

• 12π cm

Tags

CCSS.HSG.GMD.A.1

If the circumference of a circle is 30π cm, what is its radius?

• 25 cm

• 15 cm

• 20 cm

• 10 cm

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.4

CCSS.HSG.GMD.A.1

If the area of a circle is 64π cm², what is its diameter?

• 32 cm

• 4 cm

• 8 cm

• 16 cm

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.4

CCSS.HSA.REI.B.4

CCSS.HSG.GMD.A.1

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

• 8.9 cm

• 2.5 cm

• 12.3 cm

• 5.72 cm

Tags

CCSS.HSA.CED.A.4

CCSS.HSG.GMD.A.1

If the area of a circle is 100 cm², what is its circumference?

• 75 cm

• 50 cm

• 35.44 cm

• 20 cm

Tags

CCSS.HSA.CED.A.4

CCSS.HSG.GMD.A.1

If the radius of a circle is 8 cm, what is its diameter?

• 12 cm

• 20 cm

• 16 cm

• 4 cm

Tags

CCSS.7.G.B.4