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Area and Volume

SAT Math· difficulty 4/5

A solid hemisphere has radius 55. What is its total surface area (curved part plus flat circular base)?

  • A

    100π100\pi

  • B

    75π75\pi

    check_circle
  • C

    50π50\pi

  • D

    25π25\pi

Explanation

Curved =12(4πr2)=50π=\frac{1}{2}(4\pi r^2)=50\pi. Base =πr2=25π=\pi r^2=25\pi. Total =75π=75\pi.

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