# rectangle area   46 videos

• #### Surface Area of Pyramids

##### GeometryArea

How to calculate the surface area of any pyramid, emphasizing regular polygons as bases.

regular polygon lateral area apothem
• #### Using Sine to Calculate the Area of a Triangle

##### GeometryBasic Trigonometry

How to calculate the area of any triangle using two sides and an included angle.

area of a triangle sine
• #### Using Sine to Calculate the Area of a Triangle

##### TrigonometryBasic Trigonometry

How to calculate the area of any triangle using two sides and an included angle.

area of a triangle sine
• #### Using Sine to Calculate the Area of a Triangle

##### PrecalculusBasic Trigonometry

How to calculate the area of any triangle using two sides and an included angle.

area of a triangle sine
• #### Area of Regular Polygons

##### GeometryArea

How to derive the formula to calculate the area of a regular polygon.

area apothem side hexagon isosceles triangle perimeter equilateral equiangular
• #### Area of an Annulus

##### GeometryArea

How to derive the formula for the area of an annulus.

• #### Perimeter

##### GeometryGeometry Building Blocks

How to define perimeter and calculate it for squares, rectangles, and circles.

perimeter of a square rectangle and circle
• #### Area and Perimeter of Circles

##### Pre-AlgebraIntroductory Geometry

Vocabulary and formulas for the area of a circle

• #### Area With the Cross Product

##### PrecalculusSystems of Linear Equations and Matrices

How to show that the magnitude of the cross product of two vectors gives the area of the parallelogram determined by those two vectors.

cross product magnitude of vectors dot product angle between vectors area parallelogram
• #### Volume and Surface Area

##### Pre-AlgebraIntroductory Geometry

Vocabulary and formulas for surface area and volume of common solids

• #### Area Between Curves

##### AP Calculus ABAP Calculus Videos
Area between two curves area between intersecting curves curves that intersect at more than one point
• #### Area and Perimeter of Triangles

##### Pre-AlgebraIntroductory Geometry

Understanding why the area of a triangle is 1/2 base times height

• #### Rhombus Properties

##### GeometryPolygons

How to define a rhombus and compare it to a square and rectangle.

rhombus congruent sides parallelogram angle bisectors perpendicular bisectors rectangles diagonals
• #### Pythagorean Theorem Proofs

##### GeometryPythagorean Theorem

How to prove the Pythagorean Theorem using Algebra to show the area of the smaller square plus the area of four triangles is equal to the area of the larger square.

right triangle area of a square binomial squared area of a triangle side leg hypotenuse
• #### Pythagorean Theorem Proofs

##### TrigonometryPythagorean Theorem

How to prove the Pythagorean Theorem using Algebra to show the area of the smaller square plus the area of four triangles is equal to the area of the larger square.

right triangle area of a square binomial squared area of a triangle side leg hypotenuse
• #### Similarity and Volume Ratios

##### GeometrySimilarity

How to identify if two solids are similar and how to convert 1D ratios to surface area and volume ratios.

similarity volume ratios surface area
• #### Volume of Cones

##### GeometryVolume

How to compare the volume of a cone and a cylinder and how to calculate the volume of a cone given the radius and height.

volume base area height circle area
• #### Volume of Cylinders

##### GeometryVolume

How to calculate the volume of any cylinder.

volume base area height circle area rectangular prism
• #### Regions Between Circles and Squares

##### GeometryArea

How to calculate the area between a square and an inscribed circle.