• #### 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.
• #### Pascal's Triangle - Problem 1

##### Math›Precalculus›Topics in Discrete Math
Exploring Pascal's Triangle, its patterns, and its connections to binomial expansion, and combinatorics.
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• #### HL - Problem 1

##### Math›Geometry›Triangles
How to use the hypotenuse-leg (HL) shortcut to determine the congruence of vertical triangles and how to correctly denote the congruence.
• #### 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 - Concept

##### Math›Pre-Algebra›Introductory Geometry
Understanding why the area of a triangle is 1/2 base times height
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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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• #### 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.
• #### 45-45-90 Triangles - Problem 3

##### Math›Trigonometry›Pythagorean Theorem
How to find the perimeter of a square given the length of its diagonal using 45-45-90 triangles.
• #### HL - Problem 2

##### Math›Geometry›Triangles
How to use HL to determine the congruence of adjacent right triangles and how to correctly denote the congruence.
• #### 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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• #### 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.
• #### 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.
• #### 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.
• #### 45-45-90 Triangles - Problem 2

##### Math›Trigonometry›Pythagorean Theorem
How to find the length of a leg in a 45-45-90 given the hypotenuse.
• #### CPCTC - Concept

##### Math›Geometry›Triangles
How to use the principle that corresponding parts of congruent triangles are congruent, or CPCTC.
• #### 45-45-90 Triangles - Problem 2

##### Math›Geometry›Pythagorean Theorem
How to find the length of a leg in a 45-45-90 given the hypotenuse.
• #### Similar Triangles - Concept

##### Math›Pre-Algebra›Introductory Geometry
Overview of similarity: congruent angles, proportional corresponding sides
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• #### Similar Triangles - Problem 3

##### Math›Pre-Algebra›Introductory Geometry
Using proportionality for indirect measurement of a flagpole
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• #### ASA and AAS - Concept

##### Math›Geometry›Triangles
How to use the ASA and AAS shortcuts to determine the congruence of two triangles.
• #### Similar Triangles - Problem 2

##### Math›Pre-Algebra›Introductory Geometry
Using similar figures and proportionality to interpret a map that is drawn to scale
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