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Videos, games, activities and worksheets to help ACT students review plane shapes - trapezoids, regular polygons and circles. How to find the area of trapezoids, regular polygons and circles?

What is the area formula for a trapezoid?

Area of a Trapezoid = 1/2(a + b)h, where a and b are the parallel sides and h is the perpendicular height

What is the area formula for a regular polygon?

Area of a regular polygon = 1/2pa, where p is the perimeter and a is the apothem. The apothem is the perpendicular segment drawn from a side to the center of the polygon.

What is the area formula for a circle?

Area of a circle = πr

Area of Plane Figures - Trapezoids

Learn how to find the area of plane figures, particularly trapezoids.

Learn how to find the area of plane figures, particularly regular polygons.

Learn how to find the area of plane figure - circles

Learn how to find the area of plane figures, particularly circles.

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