Li Fang photography

10÷2=5dm

3. 14×5? =78.5dm？ Coverage area is 78.5 square decimeters.

Is the unit cubic meter of indoor space correct? The quantity is small, as if the cubic meter is wrong.

48 cm = 4.8 decimeter

120cm = 12 decimeter

78.5× 12+ 1/3×78.5×4.8

=942+ 125.6

= 1067.6 cubic decimeter.

1067.6 cubic decimeter = 1.0676 cubic meter ≈ 1.07 cubic meter. The size of the internal space.