• #### 30-60-90 Triangles - Problem 4

##### Math›Geometry›Pythagorean Theorem
How to find the area of an equilateral triangle given only a side length.
• #### 30-60-90 Triangles - Problem 4

##### Math›Trigonometry›Pythagorean Theorem
How to find the area of an equilateral triangle given only a side length.
• #### Area With Determinants - Problem 2

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to use the triangle area formula to test three points for collinearity.
• #### Area of a Segment - Concept

##### Math›Geometry›Area
How to derive the area of a segment formula.
• #### Solving Formulas - Concept

##### Math›Geometry›Area
How to strategize about solving formulas for variables; how to solve the area of a rectangle formula for base and height; how to solve the area of a triangle formula for base and for height.
• #### Area of Regular Polygons - Concept

##### Math›Geometry›Area
How to derive the formula to calculate the area of a regular polygon.
• #### Area of Regular Polygons - Problem 2

##### Math›Geometry›Area
How to find the length of an apothem in a regular polygon given the area and side length.
• #### Area of Regular Polygons - Problem 4

##### Math›Geometry›Area
How to find the area of a regular hexagon given only the length of the apothem.
• #### Area of Regular Polygons - Problem 3

##### Math›Geometry›Area
How to calculate the perimeter of a regular polygon given the area and apothem length.
• #### Area of Regular Polygons - Problem 1

##### Math›Geometry›Area
How to calculate the area of a regular polygon, given the length of the apothem and side length.
• #### Area of Trapezoids - Problem 1

##### Math›Geometry›Area
How to find the length of a base in a triangle where the area, other base, and height are known.
• #### 45-45-90 Triangles - Problem 4

##### Math›Geometry›Pythagorean Theorem
How to calculate the area of a 45-45-90 triangle given only the length of the hypotenuse.
• #### 45-45-90 Triangles - Problem 4

##### Math›Trigonometry›Pythagorean Theorem
How to calculate the area of a 45-45-90 triangle given only the length of the hypotenuse.
• #### 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.
• #### Similarity and Area Ratios - Problem 3

##### Math›Geometry›Similarity
How to find the area of similar triangles given one side length and one area.
• #### Area With Determinants - Problem 3

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of an irregular quadrilateral using determinants.
• #### Solving Formulas - Problem 2

##### Math›Geometry›Area
How to solve the area of a sector formula for the radius.
• #### Solving Formulas - Problem 3

##### Math›Geometry›Area
How to solve the area of a regular polygon formula for the side length.
• #### Solving Formulas - Problem 1

##### Math›Geometry›Area
How to solve for one of the bases of a trapezoid in the trapezoid area formula.
• #### Pythagorean Theorem Proofs - Concept

##### Math›Trigonometry›Pythagorean Theorem
How to prove the Pythagorean Theorem using Algebra to show the area of the smaller square plus the area of four triangles is equal to the area of the larger square.