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 4
We know that,
Area of a circle = πr2
We have,
Area of the circle = 1386 cm2
= πr2 = 1386 cm2
= r2 = \(\frac{1386}{ π}\)
= r2 = \(\frac{1386 × 7}{ 22}\)
= r2 = 441
= r = 21 cm