trapezoidal sums 30 videos
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Area of Trapezoids
Geometry Area
How to derive the area of a trapezoid formula using the area of a rectangle.
trapezoid parallelogram base height -
Trapezoid Properties
Geometry Polygons
How to identify a trapezoid and its special properties.
parallel sides isosceles trapezoid base angles base -
Trapezoid Midsegment Properties
Geometry Polygons
How to define the midsegment of a trapezoid, calculate its length, and relate it to a triangle midsegment.
midsegment trapezoid average bases midpoint -
Factoring the Sum or Difference of Cubes
Algebra 2 Factoring
How to factor the sum or difference of cubes.
factoring difference of cubes sum of cubes -
Triangle Angle Sum
Geometry Triangles
How to apply the triangle angle sum theorem.
triangle angle sum theorem 180 degrees -
Trapezoid Arch and Panel Design Problem
Geometry Polygons
How to strategize about solving a problem with trapezoidal arches.
trapezoid arch panel design interior angle equiangular polygon isosceles -
Polygon Angle Sum
Geometry Polygons
How to derive the formula to find the sum of angles in any polygon.
triangle angle sum diagonal polygon -
Sum of Digits
Algebra Word Problems Using Systems of Equations
How to solve a problem when asked to switch the digits of a 2-digit number.
sum digits word problem -
Equiangular Polygon Sums
Geometry Polygons
How to find the measure of one angle in any equiangular or regular polygon.
equiangular regular congruent triangles sum -
Geometric Series
Algebra 2 Sequences and Series
How to find the sum of a geometric series.
geometric series sum of a geometric sequence rate infinite sum finite sum -
Geometric Series
Precalculus Sequences and Series
How to find the sum of a geometric series.
geometric series sum of a geometric sequence rate infinite sum finite sum -
Arithmetic Series
Algebra 2 Sequences and Series
How to find the sum of an arithmetic series.
partial sums arithmetic series sum of an arithmetic sequence -
Arithmetic Series
Precalculus Sequences and Series
How to find the sum of an arithmetic series.
partial sums arithmetic series sum of an arithmetic sequence -
The Sine Addition Formulas
Trigonometry Advanced Trigonometry
How to derive the sine of a sum formula.
cosine of a difference formula the cofunction identities the sine of a sum formula -
The Sine Addition Formulas
Precalculus Advanced Trigonometry
How to derive the sine of a sum formula.
cosine of a difference formula the cofunction identities the sine of a sum formula -
Exterior Angles of a Polygon
Geometry Polygons
How to find the sum of the exterior angles in a polygon and find the measure of one exterior angle in an equiangular polygon.
exterior angle sum of angles equiangular polygon -
Factoring Greatest Common Factor
Pre-Algebra Polynomials
Factoring is turning a sum or difference into a product
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Supplementary and Complementary Angles
Geometry Geometry Building Blocks
How to identify supplementary and complementary angles.
angles sum right angle -
Series and Summation Notation
Algebra 2 Sequences and Series
How to define a series.
series sum of a sequence
