=5cm*6* 10^6

=3* 10^7cm

=3* 10^5m

=3* 10^2km

=300km, so the actual distance is 300km.

Two, half. Reason: Every coin toss is an independent event.

3. Perimeter increment = 2π r-2π r = 2π (r-r) = 2π * (3-2) = 2π cm = 6.28cm.