# Plane Shapes - Trapezoids, Regular Polygons, Circles

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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 = πr2, where r is the radius of the circle.

Area of Plane Figures - Trapezoids
Learn how to find the area of plane figures, particularly trapezoids.
Area of Plane Figures - Regular Polygons
Learn how to find the area of plane figures, particularly regular polygons.

Area of Plane Figures - Circles Part 1
Learn how to find the area of plane figure - circles
Area of Plane Figures - Circles Part 2
Learn how to find the area of plane figures, particularly circles.

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