Area and Circumference of Circles and Arcs

What is/are the formula(s) to find the area of a circle?

• πr²

• 2πr

• √π

Segment of a circle is the region between an arc and ———- of the circle.

• Radius

• Chord

• Diameter

• sector

The region between an arc and the two radii, joining the centre to the endpoints of the arc is called a ————–

• Sector

• Segment

• Arc

• Area

A point, whose distance from the centre of a circle is greater than its radius lies ———- of the circle.

• on circle

• in exterior

• on interior

• none of above

The length of the complete circle is called its

• Radius

• diameter

• circumference

• area

What is the circumference if the radius is worth 6 in?

• 5 in

• 37.7 in

• 12pi in

• 9pi in

Answer explanation

C=pi*d

pi*12=37.7

12*pi=12pi

Therefore 37.7 and 12pi are both the correct answers.

What is the area of a circle with a diameter of 7654 in?

What are arcs?

• Part of the diameter

• Part of the circumference

• A measurement of area

• Calculus

Answer explanation

If pi radians equals 180 degrees. 3/2 equals 1.5,

1.5pi radians equals 270 degrees.

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10