defence exam CISF Head Constable Ministerial (HCM) & ASI Steno Mock Test Series Quantitative Aptitude Geometry Quadrilaterals
Area of any regular polygon is, where n is the side of polygon, a is the length of the side.
1
n × (a2/4) × cot (180°/n)
2
n × (a2/4) × tan (180°/n)
3
n × (a2/4) × sin (180°/n)
4
n × (a2/4) × cos (180°/n)