Area and Perimeter of Circles in Terms of Pi

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

• 2 Units

• 4 Units

• 3 Units

• 7 Units

Say 'TRUE' or 'FALSE'
If areas of two circles are equal, then their circumferences are also equal

• TRUE

• FALSE

Find the area of the shaded sector of circle O. The radius is 6 inches and the central angle is 100°. Express answer to the nearest tenth of a square inch.( Use Pi =3.14)

• 25.2 in²

• 28.5 in²

• 31.4 in²

• 38.2 in²

The distance around a circle

• area

• diameter

• circumference

• radius

Area of a sector of central angle 120° of a circle is 3π cm². Then the length of the corresponding arc of this sector is:

• 5.8 cm

• 6.1 cm

• 6.3 cm

• 6.8 cm

A cathedral window is built in the shape of a semicircle. If the window is to contain three stained glass sections of EQUAL SIZE, what is the area of the YELLOW SECTOR?

• 3.3 ft²

• 4.5 ft²

• 6.3 ft²

• 7.1 ft²

The perimeters of the two circles are in the ratio 2 : 3.  The ratio of their areas is ___

• 4 : 9

• 2 : 3

• 7 : 9

• 4 : 10

Find the area of the sector. Leave your answer in terms of pi.

Find the area of the sector, rounding your answer to 1d.p.

• 748.3cm²

• 769.6cm²

• 769.7cm²

• 759.0cm²

If the circumference of a circle is 10 pi cm, what is the area of the circle in terms of pi? ________ cm^2 (NOTE: use pi in your answer. Numbers in the first 2 boxes and pi in the second 2 boxes.)