In this worksheet, we will practice identifying when to use the circumference and area formulas of circles, including arc lengths and sector areas.

**Q2: **

The radius of a circle is 21 cm and the angle of a sector is . Find the area of the sector giving the answer to the nearest square centimetre.

- A
151 cm
^{2} - B
23 cm
^{2} - C
4 055 cm
^{2} - D
473 cm
^{2} - E
193 cm
^{2}

**Q3: **

The diameter of a circle is 78 cm and the arc length of a sector is 22 cm. Find the area of the sector, giving your answer to the nearest square centimetre.

**Q4: **

The area of a circular sector is 3 872 cm^{2} and the arc length is equal to the radius. Find the perimeter giving the answer to the nearest centimetre.

**Q5: **

A circle has a radius of 42 cm, where and are two radii in the circle, and . Determine the area of the circular sector to the nearest square centimetre.

**Q6: **

is an equilateral triangle with a side length of 66 cm. An arc is drawn from a circle with centre cutting at point , at point and touching at point . Find the area of the part of the triangle bounded by , , and the arc giving the answer to two decimal places.

**Q7: **

A pendulum of length 26 cm swings . Find the length of the circular pathway that the pendulum makes giving the answer in centimetres in terms of .

- A cm
- B cm
- C cm
- D cm

**Q8: **

With circles and touching at
, the shaded area is 331 cm^{2}. Given that
, determine the sum
of the two radii correct to the nearest hundredth.

**Q11: **

is the diameter of a semicircle of length 36 cm and . Find the area of the shaded part of the diagram giving the answer to two decimal places.

**Q12: **

The area of a circular sector is 122.5 and the length of the arc is 5 cm. Find the perimeter of the sector giving the answer to the nearest centimetre.

**Q13: **

Answer the following questions for the circle shown.

Work out the circumference giving your answer to two decimal places.

Work out the area of the circle giving your answer to two decimal places.

**Q14: **

Answer the following questions for the circle shown.

Work out the circumference giving your answer in terms of .

- A
- B
- C
- D
- E

Work out the area of the circle giving your answer in terms of .

- A
- B
- C
- D
- E

**Q15: **

The radius of a circle is 37 cm and the area of a sector
is 555 cm^{2}. Find the length of the arc giving the
answer to the nearest centimetre.

**Q16: **

The radius of a circle is 40 cm and the angle of a sector is 2.9 rad. Find the area of the sector giving the answer to the nearest square centimetre.

**Q18: **

and are two chords in the circle where and . Find the area of the minor sector giving the answer to the nearest square centimetre.

**Q19: **

The area of a circle is 1 539 cm^{2}
and the arc length of a sector is 36 cm.
Find the area of the sector giving the answer to the nearest square centimetre.

**Q20: **

A circle has a radius of 4 cm and a segment has a central angle of . Find the area of the segment giving the answer to two decimal places.

**Q21: **

Determine the circumference of a circle whose area is 88 704 cm^{2}, taking .

**Q22: **

What is the circumference of a circle whose area is cm^{2}. Express your answer in terms of .

- A cm
- B cm
- C cm
- D cm

**Q23: **

Answer the following questions for the circle shown.

Work out the circumference giving your answer to two decimal places.

Work out the area of the circle giving your answer to two decimal places.

**Q24: **

The perimeter of a circular sector is 58 cm and the arc length is 26 cm. Find the area of the circle giving the answer to the nearest square centimetre.

**Q25: **

Determine, in terms of , the circumference of a circle whose area is .

- A
- B
- C
- D
- E