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Published byClyde Short Modified over 8 years ago

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Areas of Rectangles and Parallelograms Areas of Triangles, Trapezoids and Kites

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On your grid paper, draw a rectangle and tell me what the area is. How do we label our answers? What is the easy way to remember how to find the area of a rectangle? Square?

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The area of a rectangle is given by the formula ___________________, where A is the area, b is the base and h is the height. 12 in 19 in

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Given a parallelogram with dimensions and height, see if you can cut your parallelogram into pieces to figure out what the area is? Hint: think rectangles! Parallelogram Area Conjecture: The area of a parallelogram is given by ________________, where A is the area, b is the base, and h is the height. Common mistakes?

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See if you can cut and arrange your two congruent triangles to form a parallelogram. The area of a triangle is given by the formula __________________, where A is the area, b is the base and h is the height of the triangle. How is it like parallelograms?

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See if you can cut and arrange your two congruent trapezoids to form a parallelogram. The area of a trapezoid is given by the formula _________________, where A is the area, b 1 and b 2 are the lengths of the bases, and h is the height of the trapezoid.

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A rhombus is a ____________________, so we can use the parallelogram formula: __________. We can also use a kite formula for a rhombus. This formula is _________________, where d 1 and d 2 are the diagonals.

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