sat stuff

vertex formula

a(x-h)²+k

product of solutions

c/a

sum of solutions

-b/a

vertex(x value)

h=-b/2a

vertex(solutions formula)

(x1+x2)/2

the area of a triangle

1/2ah

percent change

(new-old)/old

percent change without values

initial value(first change)(second change)= new value

circle equation

(x-h)²+(y-k)²=r²

(h,k)—centre

SOHCAHTOA

sin=opposite/hypotenuse; cos=adjacent/hypotenuse; tan=opposite/adjacent

cos(a)=sin(b)

sin(a)=cos(b)

тэарэма віета

x1+x2=b

x1*x2=c

circle equation 2

x²+y²=r²

the length of an arc

(measure of an angle in radians)*(radius);

Arc Length=2πr×(angle/360)

slope

vertical change/horizontal change

distance between points

(distance between points)²=(x2-x1)²+(y2-y1)²

area of a right triangle through tan

𝑆=1/2a²*tga

a-суперацьлеглы катэт

area of a equilateral triangle

(a²sqrt3)/4

a height of equilateral triangle

asqrt3/2

a product of slopes of perpendicular lines

-1