Question

Radius of the Earth is $6400km$ and that of Mars is $4300000m$. Whose radius is more and by how much?

Answer 1

Comparing the radius of the Earth and the Mars:

The radius of the Earth is $6400km$.

The radius of Mars is $4300000m$.

So, first, we will make the units equal.

So, converting the radius of mars which is $4300000m$ into $km$.

We know that, $1km=1000m$.

Therefore, the radius of Mars$=\frac{4300000}{1000}$

$=4300km$.

Thus, $6400km>4300km$.

Hence, the radius of the Earth is greater.

Also, radius of Earth$-$radius of Mars$=6400-4300$

$=2100km$

Therefore, the radius of the Earth is greater than that of Mars by $2100km$.