If The Area Of A Circle Is 38.5m 2, Then Its Circumference Will Be _____?

If the area of a circle is 38.5m 2, then its circumference will be _____?

22 m
2.2 m
38.5 m
35 m

Explanation

Area of a circle $= π r^{2}$
$∴ 38.5 = π r^{2}$
$∴ \frac{2 2}{7} \times r^{2} = 38.5$
$\Rightarrow r^{2} = 38.5 \times \frac{7}{2 2}$
$\Rightarrow r^{2} = 12.25 \Rightarrow r = 12.25$
$∴$ $r = 3.5$
Now, Circumference of circle $= 2 π r$
$∴$ Circumference of circle $= 2 \times \frac{2 2}{7} \times \frac{3 5}{1 0}$
$∴$ Circumference of circle $= 22 m$ Area of a circle $= π r$

$^{2}$
$∴ 38.5 = π r^{2}$
$∴ \frac{2 2}{7} \times r^{2} = 38.5$
$\Rightarrow r^{2} = 38.5 \times \frac{7}{2 2}$
$\Rightarrow r^{2} = 12.25 \Rightarrow r = 12.25$
$∴$ $r = 3.5$
Now, Circumference of circle $= 2 π r$
$∴$ Circumference of circle $= 2 \times \frac{2 2}{7} \times \frac{3 5}{1 0}$
$∴$ Circumference of circle $= 22 m$

Related MCQs

A train travels at 12 km/h. How much distance will it cover in 15 minutes?

2 km
3 km
4 km
5 km

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

Speed = 12 km/h
Time = 15 minutes = 15/60 = 1/4 hour

Formula:

Distance = Speed x Time

= 12 x 1/4

$= 12 times frac{1}{4}$ $= 3 km$

$Last updated 06 Nov 2026 by NA$

In a class of 100 students, 55 study Computer Science, 50 study Mathematics, and 10 study both subjects. How many students study neither subject?

5
10
15
None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Pointing to a gentleman, Dayyan said "His only brother is the father of my daughter's father." How is the gentleman related to Dayyan?

Father
Uncle
Grandfather
None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

Sarah is twice as old as her youngest brother. If the difference between their ages is 15 years, how old is her youngest brother?

15
20
25
None of these

اس سوال کو وضاحت کے ساتھ پڑھیں

The ages of two brothers are in the ratio 3:1. If the sum of their ages is 32, what is the age of the younger brother?

8
7
6
None of these

If the area of a circle is 38.5m 2, then its circumference will be _____?

Explanation

Related MCQs

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

MCQs Categories

Latest Past Papers

Videos Lectures

If the area of a circle is 38.5m 2, then its circumference will be _____?

Explanation

Area of a circle =πr2∴38.5=πr2∴722​×r2=38.5⇒r2=38.5×227​⇒r2=12.25⇒r=12.25​∴ r=3.5Now, Circumference of circle =2πr∴ Circumference of circle =2×722​×1035​∴ Circumference of circle =22mArea of a circle =πr

2∴38.5=πr2∴722​×r2=38.5⇒r2=38.5×227​⇒r2=12.25⇒r=12.25​∴ r=3.5Now, Circumference of circle =2πr∴ Circumference of circle =2×722​×1035​∴ Circumference of circle =22m

Related MCQs

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

اس سوال کو وضاحت کے ساتھ پڑھیں

Explanation

MCQs Categories

Latest Past Papers

Videos Lectures

Sign Up

Sign In

Forgot Password