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Video: The Area of a Circle

Video: The Area of a Circle
Video: The Area of a Circle
Video: The Area of a Circle
Video: The Area of a Circle
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Resource Type
Common Core Standards
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Mpeg-4 Video File

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Product Description
This product is a 4 min 8 sec whiteboard video that helps students make sense of the formula for the area of a circle with radius r. The video also reinforces that a square centimeter is a square with sides of length 1 cm, and for measurements where the unit of measurement is the centimeter, the area is the number of square centimeters that cover the circle without gaps or overlaps. The circle of radius r is partitioned into equal-sized sectors. The sectors are rearranged into a shape that looks like a parallelogram with Base = Pi x r and Height = r. The area of a parallelogram is Base x Height, and applying this formula helps students make sense of the formula for the area of a circle. Along the way, the video shows how 1/2 of the circumference of the circle, or Pi x r, is related to the area of the circle. The video models an activity that students could follow.
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