   Question Answers

# Find the area of a quadrant of a circle whose radius is 7 centimeter.  HINT:- Before solving this question, we must know about the Quadrant of a circle.
QUADRANT OF A CIRCLE: A quarter of a circle, i.e. $\dfrac{1}{4}$ of a circle, which is made by two radiuses at right angles and the connecting arc, is called a quadrant of the circle. Let us firstly calculate the area of the circle.
\begin{align} & =\pi {{r}^{2}} \\ & =\dfrac{22}{7}\times 7\times 7=154c{{m}^{2}} \\ \end{align}
Now, as we have found the area of the circle, let us divide 154 square centimeters by 4 to find the area of the quadrant of the circle.
$\dfrac{154\text{ }}{4}=\text{ }38.5\text{ }c{{m}^{2}}$
Therefore, the area of the quadrant of the circle with a radius of 7 centimeter is 38.5 square cm.
NOTE:- The students must know the formula that is used in the above solution to calculate the area of a quadrant of a circle. If the students do not know the formula to calculate the area of a quadrant of a circle, then he/she will not be able to solve this question. Here is the formula:-
To calculate the area of a quadrant of a circle, we must know the area of the circle.
We know that the area of a circle is $\pi {{r}^{2}}$ . 
Now, to calculate the area of a quadrant, we need to divide the area of the circle by 4 (as four quadrants make a circle). So, we get,
Area of a quadrant, A= $\dfrac{\left( \pi {{r}^{2}} \right)}{4}$
Now, to find the area of a quadrant of a circle, we firstly calculate the area of the circle by the formula
$\pi {{r}^{2}}$ and then we divide it by 4.

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