7-
a) C=2piR
C=2x3,14x14
C=87,92cm
b)
C=2x3,14x16
C=100,48cm
100,48/4 = 25,16cm
8-
l=alfaxpixh/180g
lFE=72x3.14x7.2/180 lCD=72x3,14x10/180
lFE=9,0432cm lCD=12,56cm
9-
a) b)
A=pir^2 A1=3,14x13,8^2
A1=3,14x18,6^2 A1=597,9816cm2
A1=1086,3144 cm2 A2=3,14x30,4^2
A2=3,14x28^2 A2=2901,8624cm2
A2=2461,76 cm2
por ![\frac{\sqrt[]{\sqrt[4]{8}+\sqrt[]{\sqrt[]{2}-1}}-\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}-1}}}{\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}+1}}}](/latexrender/pictures/981987c7bcdf9f8f498ca4605785636a.png "\frac{\sqrt[]{\sqrt[4]{8}+\sqrt[]{\sqrt[]{2}-1}}-\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}-1}}}{\sqrt[]{\sqrt[4]{8}-\sqrt[]{\sqrt[]{2}+1}}}")
![\sqrt[]{2}](/latexrender/pictures/f21662d1cabab6e8b273a4b6f1cd663a.png "\sqrt[]{2}")
e elevar ao quadrado os dois lados)