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

Practice Questions

Q1
A cylinder has a height of 10 cm and a volume of 100π cm³. 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 height of 10 cm and a volume of 100π cm³. What is the radius of the base?
  • Step 1: Write down the formula for the volume of a cylinder, which is V = πr²h.
  • Step 2: Substitute the known values into the formula. We know the volume (V) is 100π cm³ and the height (h) is 10 cm. So, we write 100π = πr²(10).
  • Step 3: Simplify the equation. Divide both sides by π to get 100 = r²(10).
  • Step 4: Now, divide both sides by 10 to isolate r². This gives us r² = 10.
  • Step 5: To find the radius (r), take the square root of both sides. So, r = √10 cm.
  • Volume of a Cylinder – Understanding the formula for the volume of a cylinder, V = πr²h, where r is the radius and h is the height.
  • Algebraic Manipulation – Ability to rearrange equations and solve for a variable, in this case, the radius r.
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