A cylinder has a volume of 100π cm³ and a height of 10 cm. What is the radius of

Practice Questions

Q1
A cylinder has a volume of 100π cm³ and a height of 10 cm. What is the radius of the base?
  1. 2 cm
  2. 3 cm
  3. 4 cm
  4. 5 cm

Questions & Step-by-Step Solutions

A cylinder has a volume of 100π cm³ and a height of 10 cm. What is the radius of the base?
  • Step 1: Write down the formula for the volume of a cylinder: Volume = πr²h.
  • Step 2: Substitute the known values into the formula. We know the volume is 100π cm³ and the height is 10 cm, so we write: 100π = πr²(10).
  • Step 3: Simplify the equation by dividing both sides by π. This gives us: 100 = r²(10).
  • Step 4: Now, divide both sides by 10 to isolate r²: 100 / 10 = r², which simplifies to 10 = r².
  • Step 5: To find the radius r, take the square root of both sides: r = √10.
  • Step 6: Calculate the approximate value of √10, which is about 3.16 cm.
  • Volume of a Cylinder – Understanding the formula for the volume of a cylinder, which is V = πr²h, where r is the radius and h is the height.
  • Algebraic Manipulation – Ability to rearrange equations to solve for a variable, in this case, the radius r.
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