how i am going to use these two formula to get these solution ?? radius=9 and theta=8 over 3

[dev644]

 

[Harry_the_cat]

Please state the original question.

 

[dev644]

Please state the original question.

 

[Harry_the_cat]

Substitute r=9 and alpha = 8/3 into the two formulae, then simplify and factorise.
The final answer you give is incorrect. It should have 27 not 22 out the front of the bracket.

 

[pka]

View attachment 11885

Have a look at this page.
You will see the that \(\displaystyle P=x+2r~\&~A=\frac{xr}{2}\)

 

[dev644]

Substitute r=9 and alpha = 8/3 into the two formulae, then simplify and factorise.
The final answer you give is incorrect. It should have 27 not 22 out the front of the bracket.

One thing that frustrate me like **** is that all book that I bought for my maths practice, there are lots of wrongsolution , therefore I suspect my answer.

 

[dev644]

That part is the part that I don't know how to do , as I have to answer in terms of theta

 

[dev644]

I

That part is the part that I don't know how to do , as I have to answer in terms of theta

It's get hard for me to simplif it

 

[Harry_the_cat]

No you have to answer in terms of pi.

 

[Harry_the_cat]

One thing that frustrate me like **** is that all book that I bought for my maths practice, there are lots of wrongsolution , therefore I suspect my answer.

I just had another look at your work. It is a 27 out the front, your 7 looked like a 2 at first.

 

[Harry_the_cat]

Show me your attempt at substituting the values in.

 

[dev644]

Show me your attempt at substituting the values in.

I am going to sleep ?, tomorow I will do it. Goodnight sisters and brothers .