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Geometric formulas

So if you don't have these memorized, HS must have failed you lol.

I will not fail you.:thumb:

Keep in mind a couple of things. Without these formulas below you cannot estimate even basically, ANYTHING that involves building ANYTHING, including prices and amounts of materials.

Log.......


pi = = 3.141592...)
Areas

square = a2

rectangle = ab

parallelogram = bh

trapezoid = h/2 (b1 + b2)

circle = pi r 2

ellipse = pi r1 r2

triangle = (1/2) b h

equilateral triangle = (1/4)(3) a2

triangle given SAS = (1/2) a b sin C

triangle given a,b,c = [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

Volumes

cube = a3

rectangular prism = a b c

irregular prism = b h

cylinder = b h = r2 h

pyramid = (1/3) b h

cone = (1/3) b h = 1/3 r2 h

sphere = (4/3) r3

ellipsoid = (4/3) pi r1 r2 r3

Surface Areas

cube = 6 a2

prism:
(lateral area) = perimeter(b) L
(total area) = perimeter(b) L + 2b

sphere = 4 r2

 

[logrfood]

Someone said on this thread

Don't trust the formulas pasted here on da innanet.

Well, I suppose that holds true for the vast majority of a few of you:

But for the rest of us, namely me, I found the formulas on MATH.COM

A "for asians by asians" website :thumb:

Ok ok seriously, no one should trust anything said here by anyone unless you verify it yourself to the level of surety you can be comfortable in affecting.\

Or you can trust me... 4 quarters of calc, 4 quarters of stats, 4 YEARS of econ, and 2 years worth of chem and physics.

If math isn't your strong suit then make friends with a nerd. We won't BUILD your shelter for you, but we can plan it and, in exchange for you paying for it and letting us in, we will supervise you and make sure you do it right lol. bwahahahahahahahhaaha...::::

Happy Wednesday!!!

Log