Math equations Flashcards
What is the area of a triangle
0.5 X base X perpendicular height
what is the area of a rectangle
length X width
How do we know if 2 lines are perpendicular
it is an image with one line and another dashed line with a 90 degree angle inbetween
What is the area of a trapezium
sum of parrallel sides/2 X perpendicular height
what is the area for a parralelogram
base X perpendicular height
How do you interpret and plot a cumalitive frequency graph
to interpret use the upper quartile
to plot add the frequencies up gradually
how do you work out frequency density in a histogram
frequency/class width
what is the quadratic formula you need to end with
ah sq+bh+c=0
What is the equation for completing the square when finished
(x+a)sq+b
what is the equation for completing the square
(X+b/2)sq-+C-b/2
What is the general quadratic equation
ax square +bx +=0
T or F similar shapes have the same angles
true
With similar shapes what is the rule for surface area and volume if the scale factor was x
surface area is multiplied by x sq
area is multiplied by x cubed
what is the rule for idicies as a fraction ie 8 to 1/3
what is the rule for exterior angles
they add up to 360
