Răspuns:
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Bună,
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[tex] A_{disc} = \pi \times {r}^{2} [/tex]
[tex]a) \: r = 5 \: cm \\ A = \pi \times {5}^{2} \\ = \blue{25\pi} [/tex]
[tex]b) \: r = 2 \sqrt{3} \\ A = \pi \times {(2 \sqrt{3} )}^{2} \\ = \orange{12\pi} [/tex]
[tex]c) \: r = 1,2 \: cm \\ A = \pi \times (1,2 )^{2} \\ = \purple{1,44\pi} [/tex]
[tex]d) \: r = \frac{3 \sqrt{2} }{2} \\ A =\pi \times ( \frac{3 \sqrt{2} }{2}) ^{2} = \pi \times \frac{9}{2} \\ = \green{ 4,5\pi}[/tex]
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Sper că te-am ajutat.
