Perimeter of a sector

Which of the following shows the correct working out when finding the ARC LENGTH of the sector shown in the diagram?

• $\frac{45}{360}\times\left(2\times12\right)$

• $\frac{45}{360}\times\left(2\times\pi\times12\right)$

• $45\times2\times\pi\times12$

• $\frac{360}{45}\times\left(2\times\pi\times12\right)$

Which of the following shows the correct working out when finding the ARC LENGTH of the sector shown in the diagram?

• $\frac{135}{360}\times\left(2\times8\right)$

• $\frac{135}{360}\times\left(\pi\times8\right)$

• $135\times2\times\pi\times8$

• $\frac{135}{360}\times\left(2\times\pi\times8\right)$

What is the circumference of this circle with a diameter of 12cm?

• 3.14 cm

• 37.7 cm

• 24 cm

• 68.4 cm

Tags

CCSS.7.G.B.4

Find the circumference of a circle with a radius of 12.5 mm.

• 37.68mm

• 18.84mm

• 78.54mm

• none of the above

Tags

CCSS.7.G.B.4

Find the length of the arc.

• 31.42cm

• 15.71cm

• 282.74cm

• 23.56cm

Tags

CCSS.HSG.C.B.5

Given the circumference of a circle is 16 π cm, what is the radius?

• 8 cm

• 16 cm

• 8 π cm

• 4 cm

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSG.GMD.A.1

Find the exact circumference of the semicircle.

• 64 π cm

• 16 π cm

• 16 π cm

• 8 π cm