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Convert everything to meters - i.e., 20 cm. = 0.2 meters. Do the multiplication to get the area (a) of each floorboard, (b) of the entire room, then compare (divide).
The area of a circle is (pi) times (the radius)2. The radius of the given circle is 1/2 of the diameter = 20m. Area = (pi) times (20)2 = 400(pi) = 1,256.64 square meters(rounded)
0.0254 m = 1 in (exactly) → 40m = 40 ÷ 0.0254 in ≈ 1574.8 in
0.004 km.
Milo: 40m/15s= 8m/3s Mira: 30m/10s= 3m/s. Compare the fractions: 3 = 9/3 9/3 > 8/3 Therefore, Mira walks faster.