Volume of a sphere
Use V = (4/3)πr³ for a sphere with radius 6.
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.
Type 4 ÷ 3 × π × 6^3. Press 2nd and ^ for π, and the ^ key for the power.
4÷3×2ndπ^×6^3Press enter.
enter
You should see4/3*π*6^3 904.7786842
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.
Make the fraction 4 over 3 with the fraction key, then move out of it with the right arrow.
/4▼3▶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
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.
Cube 6: key in 6 and press ENTER twice, square the top copy with g then x², and multiply. This gives 216.
6ENTERENTERgx²√x×Multiply by π (g EEX), then by 4, then divide by 3.
gπEEX×4×3÷
You should see904.7787
Tips
- Cube the radius, not the diameter. Divide the diameter by 2 first if that is what you know.