Carnegie L1: Pi, The Ultimate Ratio

A circle is...

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• 
• 
• 

Radius is defined...

• ... to be the distance from one point on the circle to another point on the circle.

• ... to be the diameter of the circle divided by two.

• ... to be the area of the circle divided by its circumference.

• ... to be the distance from the center to the circumference of a circle.

What is the diameter of a circle?

• The distance from the center to the circumference.

• The distance across the circle through the center.

• The area of the circle.

• The circumference of the circle.

Which of the following best describes a chord in a circle?

• A line segment with both endpoints on the circle.

• A line that touches the circle at exactly one point.

• A line that starts on one end of the circle passes through the center and reaches the other end of the circle.

• A line that passes through the circle in two locations.

Which of the following best describes a diameter of a circle?

• A line segment with both endpoints on the circle.

• A line that touches the circle at exactly one point.

• A line that starts on one end of the circle passes through the center and reaches the other end of the circle.

• A line that passes through the circle in two locations.

Which of the following best describes a tangent in a circle?

• A line segment with both endpoints on the circle.

• A line that touches the circle at exactly one point.

• A line that starts on one end of the circle passes through the center and reaches the other end of the circle.

• A line that passes through the circle in two locations.

Which of the following best describes a secant in a circle?

• A line segment with both endpoints on the circle.

• A line that touches the circle at exactly one point.

• A line that starts on one end of the circle passes through the center and reaches the other end of the circle.

• A line that passes through the circle in two locations.

What is the circumference of a circle?

• The distance around the circle.

• The area inside the circle.

• The distance from the center to the edge of the circle.

• The line segment from one point on the circle to another.

• Pi (π) is approximately 3.14159.
• Pi (π) is a mathematical constant equal to 2.71828.
• Pi (π) is a type of fruit.
• Pi (π) is the ratio of a circle's circumference to its diameter.

• Pi (π) is a type of Thanksgiving dish.

Match the different math academic vocabulary to their respective definitions!

• The distance from the center to the edge.

• circle

• The distance across the circle through the center.

• pi

• The distance around the circle.

• circumference

• A round shape with no corners.

• radius

• Circle's circumference to diameter

• diameter