Radius of Earth = 6400 km, Radius of Mars = 4300 km. Whose radius is bigger and by how much?
Earth’s radius is bigger by 2100 km.
Step 1: Write the given radii.
\( R_{\text{Earth}} = 6400\ \text{km} \)
\( R_{\text{Mars}} = 4300\ \text{km} \)
Step 2: Decide which number is larger.
\( 6400 > 4300 \), so Earth’s radius is larger.
Step 3: Find how much larger.
Difference \(= R_{\text{Earth}} - R_{\text{Mars}} \)
\( = 6400 - 4300 \)
\( = 2100 \)
Conclusion:
Earth’s radius is larger by \( 2100\ \text{km} \).