Area accounts for the whole space.

Perimeter is the entire length of the boundary.

Plane figure that is described by a finite number of straight line (no curve sides) segments connected to form a closed polygonal chain

Regular - equal sides and angles

Two lines intersect at right angles. All sides have 90 degrees.

The lines will not intersect and will have the same distance between them.

Base x Height

0.5 x Base x Height

A circle is where the lines from the center to the outer point have equal distances from the center.

• Radius: Distance from the outer point from the center point.
• Diameter: 2 x Radius
• Circumference: The perimeter of the circle (distance around the circle)

$2.π.r$

$π.r^2$

$\pi = \frac{\text{Circumference}}{\text{Diameter}}$

$h.π.r^2$

• Translation: A translation moves a figure in a straight line by a certain distance.
• Representation: Translation is represented by a vector that gives the direction and distance of the translation. For example, the translation that moves a figure 2 units to the right and 3 units up can be represented by the vector (2, 3).

• Rotation: A rotation turns a figure around a fixed point by a certain angle.
• Representation: A rotation is represented by an angle and a point. The angle is the amount of rotation, and the point is the center of rotation. For example, a rotation of 90 degrees clockwise around the origin can be represented by the angle 90 and the point (0, 0).

• Dilation: A dilation enlarges or shrinks a figure by a certain factor.
• Representation: A dilation is represented by a scale factor. The scale factor is the amount by which the figure is enlarged or shrunk. For example, a dilation with a scale factor of 2 enlarges the figure by a factor of 2.

• Reflection: A reflection flips a figure over a line.
• Representation: A reflection is represented by a line. The line is called the mirror line. For example, a reflection across the x-axis can be represented by the line x = 0.