• #### Rhombus Properties - Problem 1

##### Math›Geometry›Polygons
How to find the angles in a rhombus created by drawing one diagonal.
• #### Area and Perimeter of Rectangles - Problem 3

##### Math›Pre-Algebra›Introductory Geometry
Finding area and perimeter of parallelograms with variables in side lengths
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• #### Area and Perimeter of Rectangles - Problem 1

##### Math›Pre-Algebra›Introductory Geometry
Finding the area and perimeter of parallelograms with integer side lengths
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• #### Writing a Good Definition - Concept

##### Math›Geometry›Geometry Building Blocks
How to write a good definition that does not have a counterexample.
• #### Deductive Reasoning - Concept

##### Math›Geometry›Reasoning, Diagonals, Angles and Parallel Lines
How to define deductive reasoning and compare it to inductive reasoning.
• #### Area and Perimeter of Rectangles - Problem 2

##### Math›Pre-Algebra›Introductory Geometry
Finding decimal approximations and exact areas and perimeters for parallelograms with square root side lengths
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• #### Area With Determinants - Problem 1

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a triangle using a determinant.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Problem 2

##### Math›Geometry›Circles
How to calculate the measure of an arc created by a cyclic parallelogram.
• #### Two Column Proofs - Problem 2

##### Math›Geometry›Triangles
How to use a two column proof to show that two angles are congruent in a parallelogram with one diagonal.
• #### Area With the Cross Product - Problem 3

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a triangle in xyz-space using vectors formed from two of its sides.