How do you size a valley rafter?

When filling a charging cylinder the refrigerant that is vented off the top of the cylinder .? How do you express r in terms of c and pi? What would be the area of a regular polygon with a perimeter of 20 feet and an apothem of 3 feet? Which IS code has tolerance limit of VDF flooring? What operation do you use to undo areas of rectangles? What is the difference between glenoid cavity and acetabulum cavity? What is the perfect square of 23? How many square feet is 9300 cubic feet? One square inch is divided into how many quarter-inch squares? What are four largest island nations of the Caribbean and the area in square miles of each? The nonadjacent angles formed by two intersecting lines? How many feet are there in 280 square feet? The area of a rectangular garden is 66 square meters The width is 8 meters longer than one half of the length What is the length and width? What figure has all triangular faces? How do you use towered in a sentence? What is the sine co sine and tangent of a 90 degree angle if it is on an isosceles right triangle? What is the perimeter of a rectangular kleenex box? What is the space inside of a circle called? What are the dimensions of a 570 sq foot room? What is the volume of a box measuring 2cm x 7cm x 3cm?