# ch 8 math

 (1) area of a triangle (2) area or a rectangle, parallelogram (3) area of a trapetzoid (4) circumference of a circle 2 formulas (5) what is pi ? (6) area of a circle (1) triangle A = 1/2bh(2) rectangle or parallelogram A = bh or lw(3) trapezoid A = 1/2(b1 + b2)(4) C = pi (r)(r) or C = pi(d)(5) pi= 22/7 or pi = 3.14(6) circle area A = pi (r)(r) 1. natural numbers 2. whole # 3. rational # 4. irrational # 5. real # 6. integers 1. natural = 1,2,3,4....2. whole = 0,1,2,3.....3. rational = number that can be written as fractions 1/2,3/4,22/7, -2/3 ......4. irrational = pi - 3.14 , .666666...., repeating decimals concept map of plane figures from polygon to square parallelagram ------ rhombus \ / \ squarepolygon -- quadirlaterial rectangle / \ trapezoid square roots are? the inverse of squaring a number 52 is 25 , square root of 25 is 572 is 49 , square root of 49 is 7 (1) what is the Pythagorean theorem? (2) in a right triangle the shortest sides are the legs (3) the side opposite the right angle is the hypotenuse (d) find the length of the hypotenuse of the triangle if the leg lengths are 12 and 9 (1) a2 + b2 = c2 (d) C2 = a2 + b2 C2 = 122 + 92 = 144 + 81 3-D figures what is a face edge prism heigth of a prism cube cylinder cone pyramid sphere pyramid face is a flat surface shaped like a polygonedge is an intersection of two facesprism is a 3-D figure with 2 parallel and congruent polygon facesheigth of a prism is the length of the perpendicular segment that joins the basescube is a rectangular prism with square facescylinder has 2 cingruent parallel circular basescone- 1 circular base and 1 vertexpyramid 3-D figure , triangular faces and 1 vertexsphere is a set of points in space that are equal distance from a center point surfacce area of a shape: cone pyramid, prism .... is surface area is the sum of all areas of its facesfind the area of its net, area of all faces (1) volume is (2) volume of a rectangular prism (3) volume of cylinder (1) 3-D figure. area of base X height = X3 (2) = Bh = lwh (3) = Bh = (pi)r2h Authordeley ID4935 Card Setch 8 math Descriptionarea formulas Updated2010-01-24T16:55:48Z Show Answers