4.2 Triangles - Hindi
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TIMESTAMPS
00:00 Why triangles matter
00:31 Triangles are classified based on properties of sides or angles
00:42 Scalene triangles, isosceles triangles, equilateral triangles
01:16 Acute-angled triangles, obtuse-angled triangles, right-angled triangles
01:57 Median, altitude, bisector, perpendicular bisector,
02:43 Sum of interior angles = 180 degrees
03:11 Exterior angle = the sum of the two opposite interior angles
04:34 Angles opposite equal sides are equal
05:02 Congruent triangles have the same angles and sides
05:47 Corresponding lines and angles
06:12 How to prove congruency: Side Angle Side (SAS)
06:42 How to prove congruency: Angle Side Angle (ASA)
07:06 How to prove congruency: Side Side Side (SSS)
07:28 How to prove congruency: Right Angle, Hypotenuse, Side (RHS)