Shinzo Abe greeting Asian Development Bank President Takehiko Nakao

What is the basic definition of a circle?

• A closed curve with all points equidistant from the center

• A shape with four equal sides

• A shape with two parallel sides

• A polygon with three sides

Which of the following is a property of a circle?

• It has parallel sides

• It has a diameter

• It has a right angle

• It has corners

What is the term for the distance from the center of a circle to any point on its edge?

• Chord

• Circumference

• Radius

• Diameter

Which of the following is an example of a circle in real life?

• A triangular road sign

• A rectangular book

• A square table

• A round clock face

How is the circumference of a circle calculated?

• π times the diameter

• 2π times the radius

• 2 times the diameter

• π times the radius squared