A sector is cut-off from a circle of radius 21 cm. The angle of the sector is 120° .Find the length of its arc and the area.

A sector is cut-off from a circle of radius 21 cm. The angle of the sector is $120^{°}$ .Find the length of its arc and the area.

Matching exercise

Match the items on the right to the items on the left.

Step 1

Step 2

Step 3

Step 4

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