1.
1) r=3см S=пи*r^2=3.14*3^2=28.26cм^2 s=28.26/2=14.13cм^2
2) r=4см S=пи*r^2=3.14*4^2=50.24cм^2 s=50.24/4*3=37.68cм^2
3) r=2см S=пи*r^2=3.14*2^2=12.56cм^2 s=12.56/4=3.14cм^2
2.
S=пи*(r1-r2)=3.14*2=6.28cм^2
3.
S=s1-s2=ab-пи*r^2=3*4-3*0.8^2=10.08см^2
1.
1) r=3см S=пи*r^2=3.14*3^2=28.26cм^2 s=28.26/2=14.13cм^2
2) r=4см S=пи*r^2=3.14*4^2=50.24cм^2 s=50.24/4*3=37.68cм^2
3) r=2см S=пи*r^2=3.14*2^2=12.56cм^2 s=12.56/4=3.14cм^2
2.
S=пи*(r1-r2)=3.14*2=6.28cм^2
3.
S=s1-s2=ab-пи*r^2=3*4-3*0.8^2=10.08см^2