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Calculate the surface area and the volume

Mathematics

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Okay, Anthony. This time we have a cylinder.

From the image, we can see:

  • Height (hh) = 10 cm
  • Radius (rr) = 4 cm
  1. Calculate the volume of the cylinder.

    The formula for the volume of a cylinder is V=πr2hV = \pi r^2 h.

    V=π(4 cm)2(10 cm)V = \pi (4 \text{ cm})^2 (10 \text{ cm}) V=π(16 cm2)(10 cm)V = \pi (16 \text{ cm}^2) (10 \text{ cm}) V=160π cm3V = 160\pi \text{ cm}^3 V≈160×3.14159 cm3V \approx 160 \times 3.14159 \text{ cm}^3 V≈502.65 cm3V \approx 502.65 \text{ cm}^3

    The volume is 160π cm3≈502.65 cm3\boxed{\text{160}\pi \text{ cm}^3 \approx 502.65 \text{ cm}^3}.

  2. Calculate the surface area of the cylinder.

    The formula for the total surface area of a cylinder is A=2πrh+2πr2A = 2\pi r h + 2\pi r^2.

    A=2π(4 cm)(10 cm)+2π(4 cm)2A = 2\pi (4 \text{ cm})(10 \text{ cm}) + 2\pi (4 \text{ cm})^2 A=2π(40 cm2)+2π(16 cm2)A = 2\pi (40 \text{ cm}^2) + 2\pi (16 \text{ cm}^2) A=80π cm2+32π cm2A = 80\pi \text{ cm}^2 + 32\pi \text{ cm}^2 A=112π cm2A = 112\pi \text{ cm}^2 A≈112×3.14159 cm2A \approx 112 \times 3.14159 \text{ cm}^2 A≈351.86 cm2A \approx 351.86 \text{ cm}^2

    The surface area is 112π cm2≈351.86 cm2\boxed{\text{112}\pi \text{ cm}^2 \approx 351.86 \text{ cm}^2}.

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