PLESE HELP MEE AND SHOWW YOUURR WOORKK PLEASE :)

a) 13.4

Step-by-step explanation:

This will use the pythagorem theorm. Which is a^2 + b^2 = c^2. You'll start with 12^2 + 6^2 = c^2. Then you'll solve from there.

12^2 + 6^2 = c^2

144 + 6^2 = c^2

144 + 36 = c^2

180 = c^2

then you'll find the square root of 180 (i don't have that symbol on my keyboard)

/180 = c

6/5 = c

then in decimal form it's 13.4164...

so rounded it's 13.4

step-by-step explanation:

pi x^2

step-by-step explanation:

pi times x squared