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Congruent legs and base angles of isosceles triangles | Congruence | Geometry | Khan Academy
By Khan Academy
Showing that congruent legs imply equal base angles and vice versa. All Khan Academy content is available for free at www.khanacademy.org
10.1 The Circle (Lesson)
By AutenMath
A lesson on circle basics: circle definition, chords, diameter, radius, circumference, area of a circle, interior of a circle, exterior of a circle
How to Find the Volume of a Pyramid
By Davitily
YouTube presents How to Find the Volume of a Pyramid an educational video resources on math.
Cylinder volume and surface area | Perimeter, area, and volume | Geometry | Khan Academy
By Khan Academy
The other frequently occurring shape is the cylinder. This video will introduce the cylinder and teach you the formulas for finding its surface area and volume.
Special Right Triangles in Geometry: 45-45-90 and 30-60-90
By PatrickJMT
Special Right Triangles in Geometry: 45-45-90 and 30-60-90 degree triangles. In this video, I discuss two special right triangles, how to derive the formulas to find the lengths of the sides of the triangles by knowing the length of one side, and then do a few examples using them!
Law of Cosines, Example SSS
By PatrickJMT
The Law of Cosines, Example 4. Here we use the law of cosines to help deduce an angle between the flightpath of two planes!
Significant Digits & Measurements
By GetChemistryHelp
Significant digits (significant figures, sig figs) indicate the precision of a measurement. This lesson explains how to determine the number of significant digits in a measurement. For practice problems and additional chemistry lessons, visit http://www.getchemistryhelp.com.
Forming comparative and superlative modifiers | The parts of speech | Grammar | Khan Academy
By Khan Academy
This video tutorial teaches how to form comparative and superlative adjectives.
The Past Tenses (Part 3)
By Smrt English
Leanne compares the different past tenses in English. She presents the past simple + past perfect simple construction.
Future Time Clauses (Part 2)
By Smrt English
Mark presents the most popular time connectors (or conjunctions).