Question

Algebra help!

Answer 1

In question 2.
s=radius x angle
s=5 x (2 x pi)/3 = 5 x 2 x 3.14 / 3 = 10.5 in

In question 1.
the answer will be c.
sqrt(2)/2= 1/sqrt2
3pi/4=135 degrees
hence, cos(135)=cos(90+45)=-sin(45)= -1/sqrt(2)
sin(135)=sin(90+45)=cos(45)=1/sqrt(2)
Hence, answer is c.

Answer 2

and for question 2

Answer 3

@anikhalder

Answer 4

Then length is given by the equation,
\[s=R\cdot\theta=5\cdot2\pi/3=10.5\ in\]

Answer 5

Thanks @John_ES