Explicación paso a paso:
[tex]p = \frac{\pi \times d}{4} + d[/tex]
Para hallar el diámetro duplicamos el radio:r=21cmx2=42cm
[tex]p = \frac{ \frac{22}{7} \times 42}{4} + 42 \\ \\ p = \frac{11 \times 6}{2} + 42 \\ \\ p = 11 \times 3 + 42 \\ \\ p = 33 + 42 \\ p = 75[/tex]
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Verified answer
Explicación paso a paso:
[tex]p = \frac{\pi \times d}{4} + d[/tex]
Para hallar el diámetro duplicamos el radio:r=21cmx2=42cm
[tex]p = \frac{ \frac{22}{7} \times 42}{4} + 42 \\ \\ p = \frac{11 \times 6}{2} + 42 \\ \\ p = 11 \times 3 + 42 \\ \\ p = 33 + 42 \\ p = 75[/tex]