Cheatography

# Geometry Unit 9 Cheat Sheet by CCRoses

Holt McDougal Geometry Chapter 10 & 11

### Theorems & Postulates

 area addition postulate the area of a region is equal to the sum of the areas of its nonove­rla­pping parts

### Formulas

 area of a parall­elogram area = bh area of a triangle area = 1/2bh area of a trapezoid area = [(b1 + b2)h]/2 area of a rhombus or kite area = 1/2d1d2 volume of a triangular prism volume = base * height volume of a rectan­gular prism volume = length width height volume of a cube volume = edge length3 volume of a cylinder volume = area of the base * height

### Vocabulary

 composite figure a figure made up of simple shapes, such as triangles, rectan­gles, trapez­oids, and circles face the flat surfaces of a 3D solid edge a segment that is the inters­ection of two faces vertex a point of inters­ection of three or more faces prism formed by two parallel congruent polygonal faces called bases connected by faces that are parall­elo­grams cylinder formed by two parallel congruent circular bases and a curved surface that connects the bases pyramid formed by a polygonal base and triangular faces that meet at a common vertex cone formed by a circular base and a curved surface that connects the base to a vertex cube a prism with six square faces net a diagram of the surfaces of a 3D figure that can be folded to form the 3D figure cross section the inters­ection of a 3D figure and a plane volume the number of nonove­rla­pping unit cubes of a given size that will exactly fill the interior