Anonymous
Anonymous asked in 科學及數學數學 · 5 years ago

面積和體積3(請盡快回答)

面積和體積,要步驟+答案,吾係太議做,吾亥幫忙教我做

https://docs.google.com/document/d/1x77kECERLEGkse...

1 Answer

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  • 5 years ago
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    2a

    S=0.5(2π)(5)+0.5(2π)(2.5)+0.5(2π)(2.5)

    S=10π

    2b

    S=0.5(2π)(5)+0.5(2π)(2)+0.5(2π)(2)+0.5(2π)(1)

    S=10π

    3a

    S=(270/360)(2π)(6)

    S=9π

    3b

    S=0.25(2π)(12)+0.5(2π)(6)

    S=12π

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