How many biggest circles can be cut out on a rectangular paperboard 20 cm long and 2 cm wide? What is the area of each circle? What's the area of the rest?

How many biggest circles can be cut out on a rectangular paperboard 20 cm long and 2 cm wide? What is the area of each circle? What's the area of the rest?

The diameter of the largest circle cut is 2, and the largest circle can be cut out: 20 ／ 2 = 10 (pieces), 3.14 × (2 ／ 2) 2 = 3.14 (square centimeter), 20 × 2-3.14 × 10, = 40-31.4, = 8.6 (square centimeter). A: 10 largest circles can be cut out, the area of each circle is 3.14 square centimeter, and the area of the remaining part is 8.6 square centimeter

A rectangular biscuit box, 10cm in length, 6cm in width and 12cm in height, if you stick a circle of brand paper around it (not up and down), at least how many square meters of brand paper

（10+6）X2X12
=32X12
=384 square centimeters
=0.0384 M2

A rectangular biscuit box, 18 cm in length, 10 cm in width and 20 cm in height. The side of the biscuit box is covered with trademarks. How many square centimeters is the area of the trademark paper at least

Let the length, width and height of a cuboid be a, B and C respectively, then its surface area is s:
S box = 2xaxb + 2xbxc + 2xcxa
　　= 2X ( aXb + bXc + cXb)
The surface area of the cuboid is 2 × (18 × 10 + 10 × 20 + 18 × 20) = 740 square centimeters
The area of trademark paper is at least 740 square centimeters