Equilateral - 3 Sides The Same - 3 Angles The Same
Isosceles - 2 Sides The Same - 2 Angles The Same
Scalene - No Sides The Same - No Angles The Same
Types Of Triangle
Properties And Classification Of Triangles
How To Fold An Equilateral Triangle
How To Construct An Equilateral Triangle
How To Fold An Isosceles Triangle
How To Construct A Triangle Using Ruler And Protractor
How To Construct A Triangle
Using Ruler And Compasses Only
When We Are Given The Lengths Of The 3 Sides
Area Of A Triangle
Area Of A Triangle
Example (1) Find The Area Of A Triangle Given Base And Height
Example (2) Find Height Of Triangle Given Area And Base
Area Of A Triangle
Find The Area Of A Triangle Given 3 Points
Area Of A Triangle
Example (1) Find The Area Of A Triangle Given Base And Height
Example (2) Find Height Of Triangle Given Area And Base
Example (3) Find Base Of Triangle Given Area And Height
Example (4) Find The Area Of A Triangle Using Sine
The Formula For This Is: Area = 0.5 x a x b x SinC
Standard Triangles
3, 4, 5 standard triangle
32 + 42 = 52
5, 12, 13 standard triangle
52 + 122 = 132
Prove That The Angles Inside A Triangle
Add Up To 180 Degrees
Find The Missing Angle Inside A Triangle (1)
Find The Missing Angle Inside A Triangle (2)
Find The Missing Angle Outside A Triangle
Find The Degrees Of A Triangle
By Solving An Algebraic Equation
Finding The Length Of Triangle Side
By Solving An Algebraic Equation
How To Find The Sides Of A 45-45-90 Right Triangle
How To Find The Sides Of A 30-60-90 Right Triangle
Find The Lengths Of 45-45-90 And 30-60-90 Triangles
Questions And Answers
About Statements Involving Congruent Triangles
Congruent And Similar Triangles
How To Find A Missing Side Of A Triangle
That Is Similar To Another Triangle
How To Find A Missing Part Of A Triangle
That Is Similar To Another Triangle
Investigating Similar Triangles
Find The Length Of A Side Of A Triangle Using Sine
Find The Length Of A Side Of A Triangle Using Cosine
Solve Right Triangles - The Basics
Solve Right Triangles - Applications
Trigonometry And Triangle Calculations
Find The Incenter Of An Acute Triangle By Folding
Incenter - the point where the three angle bisectors of a triangle meet
Find The Circumcenter Of An Acute Triangle By Folding
Circumcenter - the point where the three perpendicular bisectors of the sides of a triangle meet.
Find The Centroid Of An Acute Triangle By Folding
Centroid - the point where the three medians (line from angle to center of opposite side) of the triangle intersect
The 'center of gravity' of the triangle
Find The Orthocenter Of An Acute Triangle By Folding
Orthocenter - the point where the three altitudes (line from angle perpendicular to opposite side) of a triangle intersect
Created and Edited by Dr David Cornelius an Independent Private Maths Tutor with over 25 years of experience and The Secretary of The Association of Tutors in the UK for 15 years.
