Geometry Concepts and Terms

Ways to Prove Triangles Similar

• SSS ~

• AAA ~

• SAS ~

• AAS ~

Translations

• Sliding a figure without rotating or flipping

• Rotating a figure around a point

• Flipping a figure over a line

• Changing the size of a figure

• Area of a Sector

• Circumference of a Circle

• Area of a Triangle

• Volume of a Cylinder

• (x, y) --> (-x, -y)

• (x, y) --> (y, x)

• (x, y) --> (x, -y)

• (x, y) --> (-y, -x)

Reflections over x-axis

• (x, -y)

• (-x, y)

• (y, x)

• (-y, -x)

Your calculator should be in ______ mode.

• Radian

• Degree

• Gradian

• Binary

Central Angle

• Congruent to the arc it cuts

• Always measures 90 degrees

• Is half the measure of the arc

• Is equal to the diameter of the circle

Reflections over y = x

• (x, y) --> (y, x)

• (x, y) --> (x, -y)

• (x, y) --> (-x, y)

• (x, y) --> (-y, -x)

Point Symmetry

• A figure is symmetric with respect to a point if it looks the same when rotated 180 degrees

• A figure is symmetric with respect to a line if it looks the same when reflected across that line

• A figure is symmetric if it can be divided into two identical halves

• A figure is symmetric if it has equal angles and sides

• Arc Length

• Circumference

• Diameter

• Radius