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### 41 Cards in this Set

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 Angles of a right Triangle with one leg half the hypotenuse? 30 - 90 - 60 Reciprocal of a? 1/a Product of any number and its reciprocal? 1 (b^m)(b^n) b^m+n (b^m)/(b^n) b^m-n (b^m)^n b^mn (b^m)(c^m) (bc)^m 11^2 121 12^2 144 13^2 169 14^2 196 15^2 225 16^2 256 Cross Multiply 1/3 ? 3/8 Since 8 < 9 1/3 < 3/8 Cross Multiply 3/8 ? 45/120 8 * 45 = 3 * 120 so 3/8 = 45/120 20 / (2/3) = ? 20 * 3/2 = 30 To divide multiply by reciprocal Deviation difference from the average (x - y)(x + y) x^2 - y^2 (x - y)^2 (x^2) - 2xy + y^2 (x + y)^2 (x^2) + 2xy + y^2 Sides with the same length are opposite __________ angles equal a^2 + b^2 = c^2 if triangle is a right triangle a^2 + b^2 < c^2 if if triangle is obtuse a^2 + b^2 > c^2 if if triangle is acute Right Triangle for positive number x 3x, 4x, 5x 5, 12, ? 13 ... must know triangle In 45 45 90 triangle sides = ? x, x , x^1/2 = sqrt(x) In 30 90 60 triangle x = little 2x = hypotenuse x*(sqrt3) = long In non right triangle the sum of 2 sides is _________ than the other always greater In non right triangle the difference of 2 sides is _________ than the other always less Area of triangle? 1/2 * bh Area of equilateral triangle? ((s^2)*sqrt3)/4 Sum of n angles in polygon of n sides? (n - 2) * 180 Area of parallelogram? A = bh Area of square by diagonal A = 0.5 d^2 Area of trapezoid? A = 0.5 (base1 + base 2)height Circumference? 2piR Arc length of angle x? (x/360)(2piR) Area of sector fromed by arc with angle x? (x/360)(piR^2) Area of cube? A = 6e^2 Slope = (y2 - y1)/(x2 - x1) rise over run