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 a2-b2 (a-b)(a+b) a2+2ab+b2 (a+b)2 a2-2ab+b2 = (a-b)2 ax2+bx+c = 0 Finding the distance b/n two points D = square (x1-x2)2 + (y1-y2)2 Using two point to find the slope: Slope = Change in y --------- = Rise/Run Change in x Finding the Midpoint if the endpoints are (x1, y1) and (x2, y2), the midpoint is (x1+x2) (y1+y2) ------ ------- 2 2 -n X = 1 --- n X Using an Equation to Find the Slop (slope intercept) Y = Mx+b Length of an Arc if n is the degree measure of the arc's central angle then Length of Arc = (n/360)(2PIr) Area of Circle = PIR2 if n is the degree measure of the sector's central agnle, then the Area of a Sector (n/360)(PIr2) In a 45-45-90 right triangle the sides = x, x and x square 2 In a 30-60-90 righttriangle, the sides = x, x sq 3, 2x square 3 Area of an Equilateral triangle with side s, A = S2 sq 3 ------ 4 S square * square of 3 divided by 4 Acute angel X<90 degrees