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MATHEMATICS Solve for the area of a circle using the given radii. Show your solutions.
1) r = 11 cm


2) r = 8 cm


3) r = 7 cm​

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Solution:

1.) Radius is 11cm

  • [tex] \sf \: A = \pi r^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 11^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 11 \times 11[/tex]
  • [tex] \sf \red{ A = 379.94cm^{2} }[/tex]

2.) Radius is 8cm

  • [tex] \sf \: A = \pi r^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 8^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 8 \times 8[/tex]
  • [tex] \sf \red{ A = 200.96cm^{2} }[/tex]

3.) Radius is 7cm

  • [tex] \sf \: A = \pi r^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 7^{2} [/tex]
  • [tex] \sf \: A =3.14 \times 7 \times 7[/tex]
  • [tex] \sf \red{ A =153.86cm^{2} }[/tex]

Answer:

  • [tex] \sf 1.\red{ A = 379.94cm^{2} }[/tex]
  • [tex] \sf 2.\red{ A = 200.96cm^{2} }[/tex]
  • [tex] \sf 3.\red{ A =153.86cm^{2} }[/tex]

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