concepts & formulas Flashcards
Perimeter of any geometric figure
sum of the measure of its’s sides
area of a rectangle
length times width
circumference of a circle
π times diameter
diameter
2 times radius
area of a circle
π times R squared
area of a triangle
base * hight * 1/2
area of a parallelogram
base * hight
what is an equilateral triangle
3 equal sides and angles. each angle is 60 degrees.
Isosceles triangle
has 2 equal triangle & 2 equal sides
scalene triangle
each angle and sides aren’t equal
the sum of three angles is
180 degrees
right triangle
one angle his equal to 90 degrees
A rule about the triangle
sum of every 2 sides must be greater than the 3rd side
volume of a cylinder
π * R squared * H
volume of a prisim/box
length * width * hight
volume of cube
side * side * side
Complimentary angles
2 angles that add up to a 90 degree
supplementary angles
2 angles that add up to a 180 degree
Hypotenuse
is the opposite side of the right angle
Pythagorean theorem
a squared + b squared = c squared
number of diagonals in a shape
n (n-3)/2
sum of interior angles in a polygon
(n-2) * 180
surface area of a rectangular prism
2(LW) + 2(LH) + 2(W*H)
Volume of a sphere
4/3 π R cubed
Surface area of a sphere
4 π R squared
the area of a trapezoid
1/2 * h * (a + b)
where A & B are the 2 bases
area of an equilateral triangle
(a squared * square root of 3)/4
Where is the side length
