Circles Concepts

A line segment from the centre of the circle to a point on the circumference is called

• diameter

• chord

• arc

• radius

When 2 radii form a straight line, the line is a

• chord

• diameter

• arc

• tangent

The part of the circle enclosed by 2 radii and an arc is called the

• circumference

• segment

• sector

• tangent

The distance around the circle is called

• an arc

• the perimeter

• a chord

• a tangent

The formula for the perimeter of the circle is?

When the segment is the same as the sector, the part of the circle is called a/an

• arc

• semi - circle

• tangent

• chord

The formula for the length of the arc is