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hey what's going on you guys this is Tim

Odell with O'Dell complete concrete and

today what I want to show you guys is

how to bid out a radius concrete slab

and how to deal with these odd shaped

type of jobs and I did make a previous

video on this and I do just want to say

my math was a little off so I just want

to correct the mistake that I made wrong

and show you guys to actually better

methods of calculating a circle for when

you have these type of odd shaped jobs

when you need concrete and figuring out

this square yard of square footage and

all that kind of stuff so jumping into

it

so if this sort of the wall equals 18

and this side of the wall equals 18 and

you go out 18 and then go out 18 from

here just gonna connect it all together

so you got 18 by 18 right here's the

book where I've learned this information

from and I just didn't deliver it the

information properly to you guys or in

the better manner I had my own little

formula but it just doesn't work as well

as the the formulas that you should be

using when calculating circles pretty

much so if you want to pause the video

you can go ahead and read all of this

very informative information and I

actually have a link to the book in the

description so you can check that out

but there are two ways two main ways of

calculating area in a circle and pretty

much what we're going to be dealing with

is 1/4 of a total circle but the two

methods there are it's pretty much pi

times radius squared and the other

method is once you figure out the square

footage within your square you just

times that by 78.5%

and that will give you the exact square

footage for the radius slab or whatever

kind of odd circle you're working with

really okay so let's do the math now

so if let's go back to that picture so

18 times 18 gives us 300 a square feet

once you get that there's two ways to go

about it

you can times is by 0.785 which will

give you the exact square footage that

you need within the slab 254 square foot

or you can do it the longer way the more

traditional method which is pi 3.14

times the radius squared and the radius

would be half the circle the full circle

of this if it was a full circle would be

36 in diameter but the radius is only

half so we're only dealing with 18 feet

so we're gonna eight times that or

square it so 18 squared 18 times 18

gives you 1017 square footage of the

full circle but we only want one-fourth

of that so we're gonna divide that by 4

and that gives you 254 square foot

exactly the same as the other method

before us so these are the two best

methods of going about this when you are

calculating and trying to figure out the

square footage now to take this step

further when you want to figure out how

much concrete yardage you're gonna need

you got to first determine how thick

your concrete is going to be and for

this job we did four inches so we're

gonna times this by 0.33 or three so

that's four inches now we've got 84

cubic feet next what you want to do is

divide that by 27 cubic and that's gonna

give you 3 point 1 cubic yards in

concrete so the best method this is the

best method of going about it and if you

were to get concrete for this job you

always want to definitely order more so

I'd probably go 3 and a half

maybe even a little bit more like maybe

3 and 3/4 but if you guys were confused

on how I got the 0.33 so for people that

are new to trying to figure out and how

to bid concrete pretty much how I got

that was you divide 4 into 12 and that's

pretty much saying like you're dividing

4 inches into 12 inches so 0.33 divided

it into like one foot in a sense so

that's how you're going to be able to

get your whole number to do the

calculations to get your concrete

yardage so I hope this makes more sense

for you guys if there are any questions

go ahead and leave them down in the

comments like share subscribe if you

guys do enjoy these videos let us know

we'd love to make more and thank you

guys very much a good one

you