Photomath is a good one. So is KhanAcademy, but I don't know if they have an app version of the website.
Answer to your question is 2
Step-by-step explanation:
here you have the answers
Answer:
B. is your answer.
Step-by-step explanation:
Nice
area=pir^2
the areas are
pir^2+pi(2r)^2
they add to 8pi
8pi=pir^2+pi(2r)^2
undistribute pi
8pi=pi(r^2+(2r)^2)
divide both sides by pi
8=r^2+(2r)^2
expand
8=r^2+4r^2
add
8=5r^2
divide by 5
8/5=r^2
sqrt both sides
√(8/5)=r
double since it is double
2√(8/5) is radius of bigger aka (4√10)/5
radius=(4√10)/5
