• #### Constructing Altitudes - Problem 1

##### Math›Geometry›Constructions
How to construct an altitude in an acute triangle.
• #### Similarity Shortcuts - Problem 1

##### Math›Geometry›Similarity
How to find a missing side of a triangle using the AA similarity shortcut.
• #### The Law of Sines - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to find an angle in a triangle using the law of sines.
• #### Similarity Shortcuts - Concept

##### Math›Geometry›Similarity
How to determine if two triangles are similar using a shortcut.
• #### The Law of Cosines - Problem 1

##### Math›Precalculus›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### Indirect Measurement - Problem 1

##### Math›Geometry›Similarity
How to use a mirror and similar triangles to find the height of an object.
• #### The Law of Sines - Problem 2

##### Math›Geometry›Basic Trigonometry
How to find an angle in a triangle using the law of sines.
• #### The Law of Cosines - Problem 1

##### Math›Geometry›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### The Law of Sines - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to find an angle in a triangle using the law of sines.
• #### The Law of Cosines - Problem 1

##### Math›Trigonometry›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### Constructing Altitudes - Concept

##### Math›Geometry›Constructions
How to define an altitude and draw them on acute, right, and obtuse triangles.
• #### Indirect Measurement - Problem 2

##### Math›Geometry›Similarity
How to use shadows and similar triangles to find the height of an object.
• #### Similarity Shortcuts - Problem 2

##### Math›Geometry›Similarity
How to find a missing side of a triangle using the SAS similarity shortcut.
• #### 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 of a Segment - Problem 1

##### Math›Geometry›Area
How to find the area of a segment, given a leg in a right triangle.
• #### Trigonometric Ratios: Cosine - Concept

##### Math›Geometry›Basic Trigonometry
How to define the cosine ratio and identify the cosine of an angle in a right triangle.
• #### Trigonometric Ratios: Cosine - Problem 1

##### Math›Geometry›Basic Trigonometry
How to find the sine of an angle in a right triangle.
• #### Duplicating a Line Segment - Problem 2

##### Math›Geometry›Constructions
How to construct a triangle given three line segments.
• #### Similarity Shortcuts - Problem 3

##### Math›Geometry›Similarity
How to determine if two triangles are similar using a shortcut.
• #### Trigonometric Ratios: Sine - Concept

##### Math›Geometry›Basic Trigonometry
How to define the sine ratio and identify the sine of an angle in a right triangle.