Polygons
Last updated at March 20, 2019 by Teachoo
Regular Polygons
A Regular Polygon has
(1) all side equal
(2) all angles equal
Examples :
In ∆ ABC
AB = AC = BC
and ∠A = ∠B = ∠ C
∴ Δ ABC is a regular polygon
ABCD is a square in which
AB = BC = CD = DA
and ∠A = ∠B = ∠C = ∠D
∴ ABCD is a regular Polygon
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Regular Polygons A Regular Polygon has all side equal all angles equal Examples : In ∆ ABC AB = AC = BC and ∠A = ∠B = ∠ C Irregular polygons A Polygon which is not a regular Polygon is an irregular polygon. Examples : Δ ABC is a right angle triangle, where ∠A ≠ ∠B ≠ ∠C and AB ≠ BC ≠ AC. ∴ Δ ABC is a regular polygon ABCD is a square in which AB = BC = CD = DA and ∠A = ∠B = ∠C = ∠D ∴ ABCD is a regular Polygon ∴ Δ ABC is not a regular polygon ABCD is a rectangle, In a rectangle, all angles are 90° ⇒ ∠A = ∠B = ∠C = ∠D And opposite sides are equal ∴ AB = CD and AD = BC But, AB ≠ BC ≠ CD ≠ AD. i.e. All sides are not equal ∴ ABCD is not a regular Polygon
