Multiple choice

If the radius of a circle is ${\dfrac{7}{\sqrt\pi }}$ cm,then the area of the circle is

  1. ${154 cm ^2}$
  2. ${\dfrac{49}{\pi }}$ ${cm ^2}$
  3. ${22 cm ^2}$
  4. ${49 cm ^2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Area = pi * r^2. Given r = 7 / sqrt(pi), Area = pi * (7 / sqrt(pi))^2 = pi * (49 / pi) = 49.

AI explanation

Using the area of a circle formula, Area equals pi times the square of the radius. Substituting the radius, we get pi times the square of 7 divided by the square root of pi, which simplifies to pi times 49 divided by pi. The pi symbols cancel out, leaving the area as 49 square cm.

Keep practicing — related questions