A=3 дм 4 см b=20см c= 4 дм S=?

To find the area (S) of the given figures, we need to consider the units of measurements.

For figure a: a = 3 dm 4 cm

First, let's convert everything to the same unit, either centimeters or decimeters. Let's convert everything to centimeters here:

1 decimeter (dm) = 10 centimeters (cm)

So, 3 dm = 3 x 10 cm = 30 cm.

Now, the measurements for figure a in centimeters are: a = 30 cm 4 cm

To find the area of figure a, we use the formula for the area of a rectangle: Area = Length x Width

Length = 30 cm Width = 4 cm

Area (S) = 30 cm x 4 cm S = 120 cm^2

For figure b: b = 20 cm

The given measurement for figure b is already in centimeters.

To find the area of figure b, we use the formula for the area of a square: Area = Side^2

Side = 20 cm

Area (S) = 20 cm^2 S = 400 cm^2

For figure c: c = 4 dm

Similar to figure a, let's convert everything to the same unit, either centimeters or decimeters. Let's convert everything to decimeters here:

1 decimeter (dm) = 1 decimeter (dm)

So, the measurements for figure c in decimeters are: c = 4 dm

To find the area of figure c, we use the formula for the area of a square: Area = Side^2

Side = 4 dm

Area (S) = 4 dm^2 S = 16 dm^2

Please let me know if there is anything else I can help you with.