Cut out the largest square on a round piece of paper with a diameter of 10 cm. The square has an area of () m2

Cut out the largest square on a round piece of paper with a diameter of 10 cm. The square has an area of () m2

Because the diameter is 10 cm
Square diagonal 10cm
Side length 10 divided by root 2 equals 5 root 2
Area 50

After sawing a 3-decimeter-wide wooden strip from a square board, the remaining area is 108 square decimeters. Try to find the sawed wooden strip
How many square decimeters is the area of the hotel?

108=9×12
And 12 is three times bigger than nine
Because the width of the saw is 3 decimeters
So the side length of the square is: 12 decimeters
The sawing area is: 12 × 3 = 36 square decimeters
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After sawing a 12 meter wide strip from a square board, the remaining area is 6518 square meters. How many square meters is the area of the sawn strip?

Let x.x (X-12) = 6518 & nbsp; & nbsp; x2-12x = 651818x2-9x-65 = 0 (6x-13) (3x + 5) = 0, then 6x-13 = 0 or 3x + 5 = 0, then x = 136 or x = - 53 (rounding off) 136 × 12 = 1312 (square meters) a: the area of sawn wood is 1312 square meters