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What the angle sum in a triangle is and what it can be used for is explained in this video by Mr. G education, including examples. This makes math fun again 0:00 Intro 0:18 Angle sum explanation 1:04 Example 1 general triangle 1:43 Example 2 right-angled triangle 2:18 Example 3 isosceles triangle 3:25 Example equilateral triangle 4:02 Notes 4:46 Outro 4:59 Outtakes