Arc Length Angle in Radians

The length of an arc is 18cm and the radius of the circle is 6cm. What is the radian measure of the central angle?

• 3 radian

• 2 radian

• 4 radian

• 2π radian

Arc Length Formula:

• Radius×Radian

• Radius×Degree

• Radius×Radius

• Radian×Radian

Convert 210^o to Radians

• 7π / 6

• 21π / 10

• 5π / 6

• 9π / 4

Find the arc length

• 7 cm

• 28π cm

• 7π cm

• 28 cm

• - 0.951

• 0.951

• 0.843

• 0.231

• 1.12 rad

• 4.03 rad

• 0.732 rad

• 3.61 rad

Find the area of the shaded sector in the following diagram. Give your answer to 3 significant figures.

Leave out the units in your answer.

In the diagram below the area A of the shaded area and the angle are given. Find the value of the radius.

Leave out the unit as you write your answer.