• #### Area of Triangles - Concept

##### Math›Geometry›Area
How to derive the area of a triangle formula using the rectangle area formula.
• #### Area of Triangles - Problem 1

##### Math›Geometry›Area
How to find the height of a triangle, given the three sides of a right triangle, using the area of a triangle formula.
• #### Area of Triangles - Problem 2

##### Math›Geometry›Area
How to find an unknown variable, x, when the area is given and the base and height of a triangle is given in terms of x.
• #### Using Sine to Calculate the Area of a Triangle - Concept

##### Math›Geometry›Basic Trigonometry
How to calculate the area of any triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Problem 1

##### Math›Geometry›Basic Trigonometry
How to calculate the area of a triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Concept

##### Math›Trigonometry›Basic Trigonometry
How to calculate the area of any triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Problem 1

##### Math›Precalculus›Basic Trigonometry
How to calculate the area of a triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Problem 1

##### Math›Trigonometry›Basic Trigonometry
How to calculate the area of a triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Concept

##### Math›Precalculus›Basic Trigonometry
How to calculate the area of any triangle using two sides and an included angle.
• #### Using Sine to Calculate the Area of a Triangle - Problem 2

##### Math›Geometry›Basic Trigonometry
How to calculate the area of a regular inscribed polygon given only the radius of a circle.
• #### Area and Perimeter of Triangles - Problem 1

##### Math›Pre-Algebra›Introductory Geometry
Finding the area and perimeter of a triangle
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• #### Area and Perimeter of Triangles - Problem 3

##### Math›Pre-Algebra›Introductory Geometry
Finding the area and perimeter of triangles with variables in the side lengths
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• #### Using Sine to Calculate the Area of a Triangle - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to calculate the area of a regular inscribed polygon given only the radius of a circle.
• #### Area and Perimeter of Triangles - Concept

##### Math›Pre-Algebra›Introductory Geometry
Understanding why the area of a triangle is 1/2 base times height
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• #### Using Sine to Calculate the Area of a Triangle - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to calculate the area of a regular inscribed polygon given only the radius of a circle.
• #### Area and Perimeter of Triangles - Problem 2

##### Math›Pre-Algebra›Introductory Geometry
Finding the area and perimeter of composite shapes that contain triangles
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• #### Area of a Segment - Problem 1

##### Math›Geometry›Area
How to find the area of a segment, given a leg in a right triangle.
• #### Area of a Segment - Problem 2

##### Math›Geometry›Area
How to find the area of a segment, given a side in an equilateral triangle.
• #### Area With the Cross Product - Problem 2

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a triangle in the xy-plane using vectors formed from two of its sides.
• #### Area With Determinants - Problem 1

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a triangle using a determinant.