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Mathematics 8 Online
OpenStudy (anonymous):

The roof on Crystal’s house is formed by two congruent trapezoids and two congruent isosceles triangles. She wants to put new wood shingles on her roof. Each shingle will cover 0.25 square foot of area. (The shingles are 1 foot by 1 foot, but they overlap by 0.75 square foot.) How many shingles should Crystal buy? Update : The Triangles are 10 feet wide and 15 feet high Trapezoid height = 15 feet, top parallel is 20 feet, base is 30 feet

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