Question
Find the area of a circle whose radius is: $7\ cm.$
✓
Answer
We know that the area $A$ of a circle of radius $r$ is given by $A =\pi\text{r}^2$
Here, r $=7\text{cm}$
$\therefore\text{A}=\frac{22}{7}\times\text{7}^2=154\text{cm}^2$
Here, r $=7\text{cm}$
$\therefore\text{A}=\frac{22}{7}\times\text{7}^2=154\text{cm}^2$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Find the area of a circle whose radius is: $7\ km.$
→ Solve the following equations. Check your result in case.
$\frac{1}{2}\text{x}-3=5+\frac{1}{3}\text{x}$
→$\frac{1}{2}\text{x}-3=5+\frac{1}{3}\text{x}$
Subtract: $-x^2-3 z$ from $5 x^2-y+z+7$
→Find the value and express as a rational number in standard form:
$\frac{2}{5} \div \frac{26}{15}$
→$\frac{2}{5} \div \frac{26}{15}$
Subtract:
$2 (ab + bc + ca)$ from $- ab - bc - ca$
→$2 (ab + bc + ca)$ from $- ab - bc - ca$
13.5 kg of flour (aata) was distributed equally among 15 students. How much flour did each student receive?
In Figure, $AOC$ is a line, find $x$.
→Find the circumference of the circles with the following radius. (take $\pi=\frac{22}{7}$ )
(i) 14 cm
(ii) 28 mm
(iii) 21 cm
→(i) 14 cm
(ii) 28 mm
(iii) 21 cm
Find the area of a right angled triangle whose sides containing the right angle are of lengths $20.8m$ and $14.7m$.
→Write a positive integer and a negative integer whose difference is a positive integer.