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Geometry

Volume of a sphere

Use V = (4/3)πr³ for a sphere with radius 6.

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The volume of a sphere is four thirds times π times the radius cubed. With r = 6: V = (4/3) × π × 216 = 288π, about 904.78.

Classic Graphing 84

Start on the main screen: Press 2nd then mode (QUIT) to get back to the home screen. Pressing clear on a menu also backs out of it.

  1. Type 4 ÷ 3 × π × 6^3. Press 2nd and ^ for π, and the ^ key for the power.

    4÷3×2ndπ^×6^3

  2. Press enter.

    enter

You should see4/3*π*6^3 904.7786842

Classic Graphing 84 key reference · Classic Graphing 84 manual

Natural Scientific 991

Start on the main screen: Press MENU, then 1 (Calculate) to return to the main calculation screen. AC clears the line you are on.

  1. Make the fraction 4 over 3 with the fraction key, then move out of it with the right arrow.

    /4▼3▶

  2. Multiply by π (SHIFT, ×10ˣ), then by 6 cubed. Press = and S⇔D for the decimal.

    ×SHIFTπ×10ˣ×6x3=S⇔D

You should see904.7786842

Natural Scientific 991 key reference · Natural Scientific 991 manual

RPN Scientific 15

Start on the main screen: There is no menu to leave. Press the back arrow to clear a number you are typing, or CLx (g then back arrow) to clear the X register.

  1. Cube 6: key in 6 and press ENTER twice, square the top copy with g then x², and multiply. This gives 216.

    6ENTERENTERgx²√x×

  2. Multiply by π (g EEX), then by 4, then divide by 3.

    gπEEX×4×3÷

You should see904.7787

RPN Scientific 15 key reference · RPN Scientific 15 manual

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