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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.
Topic 15.3: Classifying Quadrilaterals
By Dylan Peters EDU
Students will be able to identify and classify quadrilaterals based on the sides, angles, and other properties.
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
Similar triangles 1
By Khan Academy
Sal reviews all the different ways we can determine that two triangles are similar. This is similar to the congruence criteria, only for similarity!
Solving problems with similar and congruent triangles
By Khan Academy
Sal uses the similarity of triangles and the congruence of others in this multi-step problem to find the area of a polygon.
Special right triangles
By Khan Academy
Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2)
Special right triangles
By Khan Academy
A few more 45-45-90 examples and an introduction to 30-60-90 triangles.
Special right triangles
By Khan Academy
Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem
Solving similar triangles 1
By Khan Academy
Sal solves two problems where a missing side length is found by proving that triangles are similar and using this to find the measure.
Find missing angles of triangles
By Khan Academy
Sal combines what we know about isosceles triangles and parallel lines with the power of algebra to solve the angles of an isosceles triangle.
Find missing angles of triangles
By Khan Academy
Three example problems involving isosceles and equilateral triangles (partly taken from Art of Problem Solving, by Richard Rusczyk).
Find missing angles of triangles
By Khan Academy
Sal solves the following problem: The measures of two angles of an isosceles triangle are 3x+5 and x+16. Find all possible values of x.
Trigonometric functions of special angles
By Khan Academy
Sal finds the trigonometric values of���������������������������/4.
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