Showing posts with label Area Formulas. Show all posts
Showing posts with label Area Formulas. Show all posts

Tuesday 31 May 2016

Area Formulas

Area Formulas


Square = a 2 
Rectangle = ab 
Parallelogram = bh 
Trapezoid = h/2 (b1 + b2
Circle = pi r 2 
Ellipse = pi r1 r2 

triangle =one half times the base length times the height of the triangle
  
equilateral triangle =

triangle given SAS (two sides and the opposite angle)= (1/2) a b sin C
triangle given a,b,c = sqrt[s(s-a)(s-b)(s-c)] when s = (a+b+c)/2 (Heron's formula)
regular polygon = (1/2) n sin(360°/n) S2
   when n = # of sides and S = length from center to a corner
   Units
Area is measured in "square" units. The area of a figure is the number of squares required to cover it completely, like tiles on a floor.
Area of a square = side times side. Since each side of a square is the same, it can simply be the length of one side squared.
If a square has one side of 4 inches, the area would be 4 inches times 4 inches, or 16 square inches. (Square inches can also be written in2.)

Be sure to use the same units for all measurements. You cannot multiply feet times inches, it doesn't make a square measurement.

Difference between stress and strain

What is the difference between stress and strain? Answer: Stress is the internal resistance force per unit area that opposes deformation, w...