Circles and Pi

Multiple Choice

What is the mathematical definition of a circle?

• A circle is a polygon with three sides.
• A circle is the set of all points in a plane that are equidistant from a fixed point (the center).
• A circle is defined by its diameter only.
• A circle is the area enclosed by a straight line.

Labelling

Label the parts of this circle.

Drag labels to their correct position on the image

Chord

Diameter

Radius

Center

Drag and Drop

The ​

Placeholder

is double the length of the ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

diameter

radius

chord

Drag and Drop

The ​

Placeholder

is the longest possible​

Placeholder

in a circle.

Drag these tiles and drop them in the correct blank above

diameter

chord

radius

Multiple Choice

What is the circumference of a circle?

• the area inside the circle

• the distance around the edge of the circle, similar to how you measure the perimeter of a square or rectangle

• the straight line that connects two points on the circle’s edge, passing through the center

Multiple Choice

Pi (π) is a letter from what alphabet?

• Latin
• Cyrillic
• Arabic
• Greek

Multiple Select

What is pi (π)?

• The ratio of a circle's circumference to its diameter

• Very tasty

• The circumference of a circle

• Approximately 3.14

Multiple Choice

Why are we learning about π in this chapter about circles?

• It is crucial for calculating the circumference and area of circles.

• π is irrelevant to the study of circles.
• We learn about π to understand the history of mathematics.
• π is only used in geometry for triangles.