In geometry, the radius of a circle is a line segment that connects the center of the circle to any point on the circle. It is the distance from the center of the circle to any point on the circle's circumference. The radius is denoted by the letter "r".

- The radius is always half the diameter of a circle.
- All radii of a circle are congruent to each other.
- The radius is used to calculate the circumference and area of a circle.

The radius is an important parameter when calculating the properties of a circle. Here are the key formulas involving the radius:

C = 2 * π * r

Where C is the circumference and π is approximately 3.14.

A = π * r^{2}

Where A is the area of the circle.

- Practice calculating the circumference and area of circles using the radius.
- Draw circles and label the radius on each to visualize its properties.
- Work on problems involving finding the radius when given the circumference or area of a circle.
- Understand the relationship between the radius and diameter of a circle.

Study GuideAlgebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer keyAlgebraic Equations Worksheet/Answer key

Algebraic Equations Worksheet/Answer keyAlgebraic Equations

Algebra (NCTM)

Represent and analyze mathematical situations and structures using algebraic symbols.

Recognize and generate equivalent forms for simple algebraic expressions and solve linear equations

Grade 6 Curriculum Focal Points (NCTM)

Algebra: Writing, interpreting, and using mathematical expressions and equations

Students write mathematical expressions and equations that correspond to given situations, they evaluate expressions, and they use expressions and formulas to solve problems. They understand that variables represent numbers whose exact values are not yet specified, and they use variables appropriately. Students understand that expressions in different forms can be equivalent, and they can rewrite an expression to represent a quantity in a different way (e.g., to make it more compact or to feature different information). Students know that the solutions of an equation are the values of the variables that make the equation true. They solve simple one-step equations by using number sense, properties of operations, and the idea of maintaining equality on both sides of an equation. They construct and analyze tables (e.g., to show quantities that are in equivalent ratios), and they use equations to describe simple relationships (such as 3x = y) shown in a table.