ACT: Math Flashcards
1
Q
The three quadratic equations
A
(x+y)(x-y)=x(2)-y(2)
(x+y)(x+y)=x(2)+2xy+y(2)
(x-y)(x-y)=x(2)-2xy-y(2)
2
Q
Pythagorean theorem
A
a(2)+b(2)=c(2)
3
Q
Area of a triangle
A
1/2•base•height
4
Q
Area of a trapezoid
A
Height•(average of the lengths of parallel sides)
5
Q
Circumference is a circle
A
2(pi)r
6
Q
Area of cirlcle
A
(Pi)r(2)
7
Q
Inscribed angles, central angles, arcs
A
Inscribed angle=1/2 central angle=1/2 arc
8
Q
Formula of a line
A
y=mx+b
9
Q
Slope of line
A
Y2-Y1/X2-X1
10
Q
Midpoint formula
A
X1+X2/2, Y1+Y2/2…..(x,y)
11
Q
Distance formula
A
(X1-X2)squared+(Y1-Y2)squared
Whole thing square root
12
Q
Circle formula
A
(x-h)squared+(y-h)squared=r(2)
13
Q
Vertical parabola
A
y-k=a(x-h)squared
14
Q
Horizontal parabola
A
x-h=a(y-k)squared
15
Q
Trigonometry
A
SOH-CAH-TOA
