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Triangle is made by joining any 3 non-collinear points.
It is a 3 sided polygon.
Polygon
Polygon is a simple closed figure made of line segments
A triangle has
3 vertices − A, B, C
3 sides − AB, BC, AC
3 angles − ∠A, ∠B, ∠C
Interior and Exterior of a Triangle
Here,
- P, Q are in interior of ∆ABC
- R is on triangle ∆ABC
- X, Y are in exterior of ∆ABC
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