It depends on the units for 20.72.
20.72 metres, rounded to the nearest tenth km is 0.0 km.
12.0 km
12.0 KM
The circumference of a circle with radius of 7 km is 44.0 km (to the nearest tenth), and the area of a circle with radius of 7 km is 153.9 km (to the nearest tenth).C = 2 pi RA = pi R2
0.4 km
1.9km
120.0
24.0
60.90
3 km
20
296.4
1.89 rounded to the nearest tenth is 1.9 - whether that is sq km, or hours, or tons.