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=π2r
=3,14x2x5
=31,4cm
k=π2r
3,14x2x15
=94,2cm
B. 94,2-31,4= 62,8
C. l=πr²
=3.14x5²
=78.2cm²
l=πr²
=3,14x15²
=706,5cm²
D. 706,5-78,2=628,3cm²
314÷100×10
= 31,4 cm
k2 = π×d
314÷100×30
= 94,2 cm
B. 94,2 - 31,4
= 62,8 cm
C. l1 = π×r²
314÷100×25
= cm²
l2 = π×r²
314÷100×225
= 70650÷100
= 706,5 cm²
D. 706,5 -
= cm²
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