• #### Constructing Altitudes - Problem 1

##### Math›Geometry›Constructions
How to construct an altitude in an acute triangle.
• #### Constructing Altitudes - Problem 2

##### Math›Geometry›Constructions
How to construct an altitude in an obtuse triangle.
• #### Constructing Altitudes - Concept

##### Math›Geometry›Constructions
How to define an altitude and draw them on acute, right, and obtuse triangles.
• #### Corresponding Parts of Similar Triangles - Problem 2

##### Math›Geometry›Similarity
How to find the length of an altitude using similar triangles.
• #### Corresponding Parts of Similar Triangles - Concept

##### Math›Geometry›Similarity
How to relate corresponding altitudes, medians and angle bisectors in similar triangles.
• #### Special Isosceles Triangle Properties - Problem 1

##### Math›Geometry›Triangles
How to find the measure of a missing length in an isosceles triangle with an altitude.
• #### Constructing the Orthocenter - Concept

##### Math›Geometry›Constructions
How to construct the orthocenter of a triangle.
• #### Climate Definition

##### Science›Biology›Ecology
The definition of climate.
• #### Constructing the Orthocenter - Problem 1

##### Math›Geometry›Constructions
How to construct the orthocenter of an obtuse triangle.
• #### 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 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.
• #### Point of Concurrency - Concept

##### Math›Geometry›Constructions
How to define point of concurrency; how to identify the four main points of concurrency in triangles.
• #### Special Isosceles Triangle Properties - Concept

##### Math›Geometry›Triangles
How to identify a segment from the vertex angle in an isosceles triangle to the opposite side.
• #### 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.
• #### Special Isosceles Triangle Properties - Problem 2

##### Math›Geometry›Triangles
How to find the measure of a vertex angle when a median is given in an isosceles triangle.
• #### Similar Triangles in Circles and Right Triangles - Problem 2

##### Math›Geometry›Similarity
How to find missing side lengths in a right triangle with an altitude drawn from the right angle.
• #### Similar Triangles in Circles and Right Triangles - Concept

##### Math›Geometry›Similarity
How to determine if two triangles in a circle are similar and how to prove that three similar triangles exist in a right triangle with an altitude.