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Unformatted text preview: Math Review 1 G e o m e t r y Here are some areas of standard geometric figures that you should remember: 1. Triangle A = 1 2 base height 2. Rectangle A = base height 3. Circle A = radius 2 Triangle Rectangle Circle base base diameter height height radius The volume of a sphere is 4 3 R 3 , its surface area is 4 R 2 . The circumference of a circle is 2 R , where R is the radius, or D , where D is the diameter ( D = 2 R ). The volume of a right figure is is V = A h , where h is the height of the figure, and A is the area of the base. If the base is a circle, then were talking about a right cylinder and A = R 2 . If the base is a rectangle, you get the idea. Area height 2 A l g e b r a Solving linear equations is easy: Ax + B = C implies the solution for x is x = ( C B ) /A . Solving quadratic equations: Ax 2 + Bx + C = 0 implies x = B B 2 4 AC 2 A . Solving a system of 2 equations with 2 unknowns: if A 1 x + B 1 y = C 1 A 2 x + B 2 y = C 2 (where the A i s, etc., are constants) then you can solve the first equation fors, etc....
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