Need Maths Help +REP!

[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.

[Black_Apalachi]

Oh yeah, I see what you mean. Either it's really not to scale or the measurements are wrong .

[Soka]

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.

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.

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.

[Black_Apalachi]

I'm gonna bet that my method is correct but the measurements are the wrong way round .

[Soka]

I'm gonna bet that my method is correct but the measurements are the wrong way round .

I agree, as its the method I posted aswell before you .

I just didn't want to post the answer, people should work for it.

[Black_Apalachi]

Oh OK lol sorry, I didn't understand any of the other methods that were posted so must have read yours wrong

[scottish]

don't you use herons formula as you know all sides of triangle?

where s is the semiperimeter of the triangle:

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

[kk.]

don't you use herons formula as you know all sides of triangle?


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 after

[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

[kk.]

i thought u meant you wernt actually english, like u were french lol. shouldve guessed by the name