• #### Conservation of Energy

##### Science›Chemistry›Thermochemistry
How energy is neither created nor destroyed.
• #### Conservation of Energy

##### Science›Physics›Heat and Thermodynamics
How energy is neither created nor destroyed.
• #### Conservation of Energy

##### Science›Physics›Energy and Momentum
How energy is neither created nor destroyed.
• #### Trapezoid Midsegment Properties - Problem 1

##### Math›Geometry›Polygons
How to find the length of a trapezoid midsegment and the angles created by the midsegment.
• #### Kite Properties - Problem 3

##### Math›Geometry›Polygons
How to find the angles in a kite created by the diagonals in terms of a variable.
• #### Rhombus Properties - Problem 1

##### Math›Geometry›Polygons
How to find the angles in a rhombus created by drawing one diagonal.
• #### Law of Conservation of Mass

##### Science›Chemistry›Chemical Reactions
Understanding the law of conservation of mass.
• #### Triangle Midsegment Properties - Problem 2

##### Math›Geometry›Polygons
How to solve for angles in a triangle created by a midsegment.
• #### Kite Properties - Problem 1

##### Math›Geometry›Polygons
How to find the angles created by the two diagonals in a kite.
• #### Rectangle and Square Properties - Problem 1

##### Math›Geometry›Polygons
How to find the angles in a square created by drawing diagonals, and finding the lengths of those diagonals.
• #### Angle Bisectors and Opposite Side Ratios - Problem 1

##### Math›Geometry›Similarity
How to find a missing length created by a median in a triangle using a proportion.
• #### Proportional Segments Between Parallel Lines - Problem 2

##### Math›Geometry›Similarity
How to find missing lengths created by two parallel lines passing through a triangle.
• #### Corresponding Angles - Problem 1

##### Math›Geometry›Reasoning, Diagonals, Angles and Parallel Lines
How to identify corresponding angles created by two parallel lines and a transversal.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Problem 2

##### Math›Geometry›Circles
How to calculate the measure of an arc created by a cyclic parallelogram.
• #### Central Angles and Intercepted Arcs - Problem 4

##### Math›Geometry›Circles
How to find the measure of an arc created by the vertices of an inscribed regular polygon.
• #### Alternate Interior Angles - Problem 2

##### Math›Geometry›Reasoning, Diagonals, Angles and Parallel Lines
How to fine a missing angles created by two parallel lines and two transversals.