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

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Presentation transcript:

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

 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?

 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

 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?

 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?

 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.

 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.