Math-Geometry (PACE 1081)

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Area (Parallelogram)

A = b • h

Area (Triangle)

A = b • h / 2 (A = 1/2 bh)

Circle

A closed plane figure with all its points the same distance from the center.

Diameter

A line segment that passes through the center of a circle with end points that lie on the circle.

Chord

A line segment with endpoints that lie on a circle. It may or may not pass through the center of the circle.

Prism

A polyhedron with two bases.

Central Angle

An angle with its vertex at the center of the circle.

Radius

Any line segment that goes from the center of a circle to a point on that circle.

Polygon

Closed plane figure is made up of three or more line segments, which form their sides.

Edge

In a polyhedron, it is formed by the intersection of two faces.

Base

One of the two parallel and congruent faces on a polyhedron.

Arc

Part of a curved line of a circle.

What are the two ways to write pi?

Pi = 3.14 and Pi = 22/7

Radii

Plural of "radius"

the surface area of a triangular prism

SA =2A+PH

SA of rectangular prism

SA=2(lxw)+2(lxh)+2(WxH)

SA of square

SA=6s2

Circumference

The distance around a circle.

Perimeter

The distance around a figure or an object.

Area

The number of square units needed to cover a figure or surface.

Vertices

The points at which three or more edges intersect.

Perimeter (Regular Polygon)

The sum of all the side lengths.

Surface Area

The sum of the areas of all the faces of a prism.

Similar Polygons

Two polygons that have the same shape but not necessarily the same size.

circumference of a circle

c=3.14xd or 2x3.14r

Pyramid

A polyhedron with triangular faces that all meet at a vertex.

Polyhedron

A three-dimensional figure that has flat faces shaped like polygons

How many degrees are in a triangle?

180 degrees

Area (Circle)

A = 3.14 • radius2

Face

A flat surface shaped like a polygon.


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