Area and Perimeter: Working Backwards. Challenge 1 The height of a rectangle is twice the base. The area of the rectangle is 450 in 2. What is the height?

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Presentation transcript:

Area and Perimeter: Working Backwards

Challenge 1 The height of a rectangle is twice the base. The area of the rectangle is 450 in 2. What is the height? 30 in

Challenge 2 The height of a trapezoid is 12 cm. One of the bases of a trapezoid is 35 cm. The area of the trapezoid is 360 cm 2. What is the length of the other base? 25 cm

Challenge 3 Find the circumference of the outer circle, if the width of the ring is 2 units. Write your answer in terms of pi. C= (2r+4)π r 2

Challenge 4 The label on a box containing a triangular sail indicates the sail has an area of 40 square feet, and a base length of 8 feet. Write a formula that could be used to find h, the height of the triangle with a base of length b and an area of A. 2A2A b h =

Challenge 5 Larry wants to paint his room. There are 4 walls to paint, all the same size. He measures one wall to be 20 ft high and 45 ft wide. One gallon of paint will cover 250 sq. ft. How many gallons of paint will Larry need to buy? 15 gallons