Formulas Flashcards
AREA of Triangle
1/2(base)(height)
How many INTERGERS are there between # through #?
B - A + 1
Isosceles Triangles
2 equal sides & 2 equal angles
Special right triangle 45-45-90
Equilateral Triangles
3 equal sides & 3-60* angles
Similar Triangles
Angles are equal
2-5-6
4-10-12
Find HYPOTENUSE or LEG of right triangle
A^2 + B^2 = C^2
Special Right Triangle 30-60-90
Ratio ✅3 : 1 : 2
Special Right Triangle 45-45-90
Ratio 1 : 1 : ✅2
Special Right Triangle (#-#-#)
3-4-5
5-12-13
10-24-26
15-36-39
PERIMETER of Rectangle
2(length + width)
AREA of Rectangle
(Length)(width)
AREA of Square
(Side)^2
AREA of Parallelogram
(Base)(height)
AREA of Trapezoid
A + B
______ (height)
2
CIRCUMFERENCE of Circle
Given RADIUS: 2(pi)r
Given DIAMETER: (pi)d
Find ORIGINAL WHOLE (pop.) before % increase/decrease
% ✖️ original = increase or decrease
Original = increase or decrease / %
SIMPLE INTEREST
$ ✖️ % ✖️ time
COMPOUND INTEREST
Cash ✖️ (1 + interest rate)^C
(______________)
( # times C )
AVERAGE RATE (given: miles traveled & returned, mph traveled & returned)
HRS = miles / mph
AV. SPEED = total miles / total hrs
1 or sum of all angles of Regular Polygon
(n - 2) ✖️180
_____________
n
LENGTH of ARC (circle)
(n / 360) ✖️2(pi)r
AREA of a SECTOR (circle)
(n / 360) ✖️(pi)r^2
VOLUME of a Rectangular Solid
(L)(w)(h)
SURFACE AREA of a Rectangular Solid
2(Lw) + 2(wh) + 2(Lh)
VOLUME of Cylinder
(pi)r^2h
SURFACE AREA of Cylinder
2(pi)r^2 + 2(pi)rh
