The area of a circle is 1386 cm2. What is the radius of the circle? [Use π = $\frac{22}{7}$]
Answer & explanation
Correct answer: option 1
We know that,
Area of a circle = πr2
Given,
Area of the circle = 1386 cm 2
πr2 = 1386
= \(\frac{22}{7}\)× r2 = 1386
= r2 = 1386 × \(\frac{7}{22}\)
= r2= 63 × 7
= r = \(\sqrt {441}\) = 21 cm