Question

KINDLY ON THIS FORMULA (a×b)×c, a×(b×c) please solve the question a=3/5,b= -1/7 c= -1/2 ...?​

Answer 1

I think it is a fair answer

Here is your mistake: η≠π/3

AD

sinδ

=

b

sinη

⟹sinη=

3

5

and so cosη=

4

5

Now, sinψ=sin(π−(η+

π

4

))=sin(η+

π

4

)=

1

√

2

(sinη+cosη)=

7

5

√

2

So using

CD

sinψ

=

AD

sinδ

, CD=21

√

2

a′.

As you know all sides, adding them leads to perimeter of (12

√

3

+36

√

2

)a