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15 Cards in this Set

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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