http://img691.imageshack.us/img691/5...angle04.th.gif
EXAMPLE:
A=5
B=4
C=3
How are you even meant to calculate the area of that I don't get it :S
Could do with a reply by Sunday.. Got HW on it xD
AND BTW, That is not a question on my HW xD
Printable View
http://img691.imageshack.us/img691/5...angle04.th.gif
EXAMPLE:
A=5
B=4
C=3
How are you even meant to calculate the area of that I don't get it :S
Could do with a reply by Sunday.. Got HW on it xD
AND BTW, That is not a question on my HW xD
If your calculating the area you times each side by one another. EX " A x B x C = 5 x 4 x 3 Hope it helped! : )
Not this.Quote:
Originally Posted by Meree.
Only thing I can think of is.. if the sides are 3,4,5 then there may be a pythagorean triple formed.. so it will be a right angled triangle.
You can use the formula Area = 1/2 * base * height, which you can apply yourself.
This might not be correct though, my brains a bit dead at the moment!
Or were you just using the numbers 3,4,5 as example?
Area = 1/2 x B x H doesn't apply here as all the sides are different.
If I'm correct, Meree is correct. Multiply all the sides together.
I thought the 1/2 Base * Height always worked? You just need to drop a perpendicular from one point of the triangle to the other side and use that as the height, and use the base as the length of the side you dropped the line to.
Oh I thought it only worked on right-angled traingles as the base and height is easier to spot.
This is correct. I know you definitely don't multiply all the sides together lolQuote:
Originally Posted by Soka
you can either find the line don to form two right angled triangles, or try the 3 4 5 triangle rule
This is a blast from the past but AB looks like a right angle. Therefore the whole triangle is half of a rectangle. So just multiply the two sides of this rectangle as you would normally, but because it's only half of one, divide it by 2.
So; (5x4)/2 = 10
I hated maths and thought I was rubbish at it even though they kept me in the top set for ever, so I may be wrong.
not possible since the apparent hypotenuse is shorter than the other two sidesQuote:
Originally Posted by Sergio
Why not?Quote:
Originally Posted by kk.
oh im not saying your methods wrong, it would work if A=3 B=4 and C=5 but the way that hes given it makes it not possible to use that method.
right angled triangles has to have the longest side opposite the right angle, otherwise its not right angled.
Oh yeah, I see what you mean. Either it's really not to scale or the measurements are wrong :P.
This is never the case when working out the area of any 2d shape, i think you and Meree are getting confused with the perimeter, where you add all sides of the shape.Quote:
Originally Posted by Jay.
1/2*B*H does not apply if it is not a right angled triangle, not if all sides are different.
Maybe the OP could post the whole wording of the question, with a better diagram.
I'm gonna bet that my method is correct but the measurements are the wrong way round :P.
I agree, as its the method I posted aswell before you :P.Quote:
Originally Posted by Sergio
I just didn't want to post the answer, people should work for it.
Oh OK lol sorry, I didn't understand any of the other methods that were posted so must have read yours wrong :P
don't you use herons formula as you know all sides of triangle?
Quote:
Originally Posted by http://en.wikipedia.org/wiki/Heron's_formula
s = a + b + c / 2
s = 5 + 4 + 3 / 2
s = 12 / 2
s = 6
A = √s(s-a)(s-b)(s-c)
A = √6(6-5)(6-4)(6-3)
A = √6(1)(2)(3)
A = √36
A = 6
or
A = √(a+b+c)(a+b-c)(b+c-a)(c+a-b)/16
A = √(5+4+3)(5+4-3)(4+3-5)(3+5-4)/16
A = √(12)(6)(2)(4)/16
A = √576/16
A = √36
A = 6
dno not done that stuff in like 4 years ;l
edit; is it a right angled triangle or not? :S
i have never seen that before.. ever lol. and ive finished a level so i doubt its the level theyre afterQuote:
Originally Posted by scottish
ah k, would have been better posting the exact quest instead of making one up as evidently its failed due to incorrect figures and by looking at the image can't judge if its right angled or not
also i'm nto english so don't know whats covered :P
i thought u meant you wernt actually english, like u were french lol. shouldve guessed by the name :P
yeh, or location kinda gives it away :P
shazzy post the real questions and stuff or close enough to it instead of completely made up numbers :P
Heron's formula may be the way to go about it. But, Heron's formula does not work on some triangles (triangles with a small angle for example). Therefore the answer is either 6, or 10.Quote:
Originally Posted by scottish
Http://img693.imageshack.us/img693/6904/ldt1005i.th.jpg
This is an question to my homework: Not sure if the picture is clear enough..
A = 6M *Thats the ____ Bottom line)
B = 5M (Left STRAIGHT Side)
6 thing = ??? (Not given.) Right diagonal side
Thats really unclear, Sorry.
Area pls. and formular
1/2 x b x h.
so 1/2 x 6 x 5 = ...
Yeah, if its a right angle (which is known as true as it has the square mark in the corner meaning 90 degrees), then simply use the 1/2 x base length x height.
Simple enough :)
i think it is Area = B X H divide by 2Quote:
Originally Posted by BlurredView
so i think a and b is b+h as they are the shorter of the 2 sides so maybe
5x4 divide 2 = 10 i think
but for volume i think you would multiply all 3.
hope i helped or even made any sense
Area= bxh divided by 2Quote:
Originally Posted by BlurredView
so = 6x5 divided by 2
= calulate it ur self lol
hope i helped and i am pretty sure that is how you do it.
Edited by SuperNic. (Forum Moderator): Please don't multiple post within the 15 minute edit time, thanks.