![]() Want to change the area unit? Simply click on the unit name, and a drop-down list will appear. Regular polygon area formula: A = n × a² × cot(π/n) / 4.Parallelogram: has two pairs of parallel sides. Isosceles trapezium (UK)/isosceles trapezoid (US) is a special case with equal base angles. Trapezium (UK) / trapezoid (US): at least one pair of opposite sides are parallel. Quadrilateral area formula: A = 1/2 × e × f × sin(angle) That's the case in which our parallelogram area calculator is particularly useful.Octagon area formula: A = 2 × (1 + √2) × a².Hexagon area formula: A = 3/2 × √3 × a².Trapezoid area formula: A = (a + b) × h / 2. ![]()
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