# Circle- Diameter, Chord, Center, & Radius Worksheets

What are the Measures of a Circle: Diameter, Chord, Center, & Radius? The first ever shape that we come across is the shape of a circle in geometry. A circle is round shaped figure that can be easily drawn with a center point which is just a radius away. An interesting thing about circle is that the distance from its radius to any point on the circle is the same. When you talk about circles, there are three lines that you have to consider; the radius, the chord, and the diameter. Diameter: The diameter of a circle is the line segment that passes through the center of the circle. The diameter is twice the radius. Chord: The chord refers to the line segment that connects two points on a circle. Radius: A circle's radius is the distance from the center point of the circle until any point on the circle. The radius tells you the size of the circle. In addition to being a line segment that connects the center point to anywhere on the circle, it is also one half of the diameter.

• ### Basic Lesson

Guides students through the measures of a circle including diameter, chord, center, & radius. The radius of a circle is the distance from the center of the circle to any point on the circle. The diameter of a circle is longest distance across a circle. (The diameter cuts through the center of the circle. This is what makes it the longest distance.) A chord of a circle is a line segment that connects one point on the edge of the circle with another point on the circle. (The diameter is a the longest chord) The center is a point inside the circle. All points on the circle are equidistant (same distance) from the center point.

• ### Intermediate Lesson

Demonstrates how to identify a measure within a circle.

• ### Independent Practice 1

Write name of the designated coordinates (diameter, chord, center, or radius).

• ### Independent Practice 2

Students determine the measures within a circle in 20 assorted problems. The answers can be found below.

• ### Homework Worksheet

Students are provided with 12 problems to review circle measurements.

• ### Skill Quiz

This tests the students ability to understand measures within circles.

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.

• ### Lesson and Practice Answer Key

Answers for both lessons and both practice sheets.

#### Geometric Fun Fact:

Did you know that the largest pentagon in the world is right here in the United States? That's right! The Pentagon in Washington D.C. is so big that the national Capital could fit inside any one of its five wedge-shaped sections featuring 17.5 milers of corridors! Now, that's some maze!