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Acute Triangle - YourTeacher.com - Geometry Help
By yourteachermathhelp
In this lesson students learn to classify triangles as acute (all angles acute) right (one angle right) or obtuse (one angle obtuse). Students also learn that the sum of the measures of the angles of a triangle is 180 degrees and students are asked to use this formula to find the measures of missing angles in given triangles.
Geometry Basics | MathHelp.com
By MathHelp.com
This lesson covers permutations. Students learn that a permutation is an arrangement of objects in which the order is important. For example, the permutation AB is different than the permutation BA. Students are then asked to solve word problems involving permutations. For example: Find the number of different ways 6 books can be arranged on a shelf. Note that the number of permutations can be found by multiplying the number of choices for the 1st position (6 books) times the number of choices for the second position (5 books), and so on. So the number of permutations is 6 x 5 x 4 x 3 x 2 x 1, or 720. In other words, there are 720 different ways 6 books can be arranged on a shelf.
Proof: Alternate Exterior Angles Converse
By Mathispower4u
Proof: Alternate Exterior Angles Converse
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!
Triangles
By MathPlanetVideos
Find out whether the triangles are right, isosceles, acute, scalene, obtuse or equilateral
Inscribed Angles - YourTeacher.com - Geometry Help
By yourteachermathhelp
Students learn the definition of an inscribed angle, and that the measure of an inscribed angle is equal to ½ the measure of its intercepted arc. Students also learn the following theorems related to inscribed angles. If two inscribed angles intercept the same arc, then the angles are congruent. An angle inscribed in a semicircle is a right angle. If a quadrilateral is inscribed in a semicircle, then opposite angles are supplementary. The measure of an angle formed by a chord and its tangent is half the measure of the intercepted arc. Students are then asked to find the missing measures of arcs and angles in given circles using these theorems.
How to Apply Postulate 13 to Similar Triangles
By Khan Academy
Video uses an electronic black board with different colored pens. This video is an introduction to similar triangles. The person discusses the meaning of the term similar then goes on to discuss similar triangles (they have all the same angles), and why they are considered similar (ratio of corresponding sides is the same). Video then gives examples to help students understand the terms used and how to find similar angles. Good quality video. Good for middle elementary and middle school students.
Central Angles and the definition of a radian
By Learners TV
Central Angles and the definition of a radian
30-60-90 Triangles II
By Khan Academy
More examples using 30-60-90 triangles.. All Khan Academy content is available for free at www.khanacademy.org
Find Quadrant and Trig Values of angles: tan? and sec?, given sin?=3/5 and cos? is negative.
By TucsonMathDoc
YouTube presents Find Quadrant and Trig Values of angles: tan? and sec?, given sin?=3/5 and cos? is negative., an educational video resource on math.
Similar Triangles, Part 2 - Khan Academy
By Khan Academy
Video uses an electronic black board with different-colored pens. In this video. Mr. Khan discusses the measurement of alternate interior angles, corresponding angles and how they are similar. Triangles are drawn in two parallel lines and a transversal. Narrator shows how to figure out the length of the sides of the angles when three sides are known. Good quality video. Good for middle elementary and middle school students.
Understanding Rectangles: 2.G.2
By Tenmarks Amazon
a rectangle is partitioned into rows and columns. The total number of partitioned pieces are identified.
45-45-90 triangles | Right triangles and trigonometry | Geometry | Khan Academy
By Khan Academy
Video uses an electronic black board with different colored pens. Introduction to 45-45-90 Triangles, these can also be called right triangles because of the 90 degree measurement. These triangles are special because if two angles of a triangle are equal the one side they don’t share is going to be equal. This then goes on to explain Pythagorean Theorem, Side A squared + Side B squared = Side C squared, side C is the hypotenuse or the side that is shared in a triangle. The narrator goes on to explain how to solve, using square roots. This video is for middle school students.
47 - Arcs and Angles, Inscribed Angles
By thenewboston
This is a video lecture course on Introduction to Geometry.
Similar Triangles, Part 2 - Khan Academy
By Khan Academy
Video uses an electronic black board with different-colored pens. In this video. Mr. Khan discusses the measurement of alternate interior angles, corresponding angles and how they are similar. Triangles are drawn in two parallel lines and a transversal. Narrator shows how to figure out the length of the sides of the angles when three sides are known. Good quality video. Good for middle elementary and middle school students.
Using a Protractor to Measure Angles: 4.MD.6
By TenmarksAmazon
Students learn to use a protractor to measure angles
Geometry - 10 - Proving Triangles are Similar
By thenewboston
Youtube Presents Geometry - 10 - Proving Triangles are Similar an educational video resources on math.