Saw the biggest circle from a rectangular board 5 decimeters long and 4 decimeters wide. How many square decimeters are the remaining boards?

Saw the biggest circle from a rectangular board 5 decimeters long and 4 decimeters wide. How many square decimeters are the remaining boards?

The area of rectangular board: 5 × 4 = 20 (square decimeter), radius of circle: 4 △ 2 = 2 (decimeter), area of circle: 3.14 × 22 = 12.56 (square decimeter), area of remaining board: 20-12.56 = 7.44 (square decimeter), answer: area of remaining board is 7.44 square decimeter

Saw the biggest circle from a rectangular board 5 decimeters long and 4 decimeters wide. How many square decimeters are the remaining boards?

The area of rectangular board: 5 × 4 = 20 (square decimeter), radius of circle: 4 △ 2 = 2 (decimeter), area of circle: 3.14 × 22 = 12.56 (square decimeter), area of remaining board: 20-12.56 = 7.44 (square decimeter), answer: area of remaining board is 7.44 square decimeter

The largest circle is sawed from a rectangular board with a length of 5 decimeters and a width of 3 decimeters. The remaining board area is square decimeters
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The square of 5 × 3-3.14 × (3 △ 2)
＝15－3.14×2.25
＝15－7.065
= 7.935 (square decimeter)

From a 5 decimeter long, 4 decimeter wide rectangular board saw a largest circle, find the area of this circle is how many square decimeters?

Saw the largest circle from a rectangular board 5 decimeters long and 4 decimeters wide. Find the area of the circle
π× (4 / 2) & # 178; = 4 π = 12.56 square decimeter
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