Someone please solve all five of these please you get 30 points and If you are correct I will make brainlienst please

15.The ratio is (√2)/2.

11 A. A=314.2in^2

6.

figure C

Perimeter

3 * (1/2) * (6π) + (1/2) * (18π) = 18π cm

Area

3 * (1/2) * ((3 ^ 2) π) + (1/2) * ((9) ^ 2π) = 54π cm ^ 2

Figure B

Perimeter

6 * (1/2) * (4π) + 2 * (4) = (12π + 8) cm

Area

3 * (4 * 4) = 48 cm ^ 2

11 B. 78.54 cm^2

Step-by-step explanation:

I cant insure they are all right

do i do it on a graph?

step-by-step explanation: