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=22/7.7.7
=154 cm²
b.=2Πrt
=2.22/7.7.10
=440 cm²
c.=Πr(r+2t)
=22/7.7(7+20)
=594 cm²
d.=2Πr(r+t)
=2.22/7.7(7+10)
=784 cm²