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

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?

Draw the largest semicircle in a rectangle 10 cm long and 8 cm wide. Its circumference is Cm, the area is Square centimeter

3.14 × 10 ／ 2 + 10 = 15.7 + 10 = 25.7 (CM) 3.14 × (10 ／ 2) 2 ／ 2 = 3.14 × 25 ／ 2 = 39.25 (square cm); answer: the circumference of this semicircle is 25.7 cm and the area is 39.25 square cm. So the answer is: 25.7; 39.25

A square aluminum sheet, side length 8 decimeters, use this square to cut the largest circle, the remaining area is [] square decimeters

8 & # 178; - π 4 & # 178; = (4-3.14) × 16 = 13.76 square decimeter

Given that the side length of a square is (a + 2), dig out a circle with a radius of (A-1) and calculate the remaining area

If the square area is (a + 2) &# 178;, and the excavated part is π (A-1) &# 178;, then the remaining part is:
S=(a＋2)²－(a－1)²π

The side length of a square paper is a. cut a small square with side length of B (a > b) from this paper. Use letters to indicate the area of the remaining part______ ．

The area of the remaining part is A2-B2. A: the area of the remaining part is A2-B2

The side length of a square paper is a. cut a small square with side length of B (a > b) from this paper. Use letters to indicate the area of the remaining part______ ．

The area of the remaining part is A2-B2. A: the area of the remaining part is A2-B2

The side length of a square paper is a. cut a small square with side length of B (a > b) from this paper. Use letters to indicate the area of the remaining part______ ．

The area of the remaining part is A2-B2. A: the area of the remaining part is A2-B2

The side length of a square paper is a. cut a small square with side length of B (a > b) from this paper. Use letters to indicate the area of the remaining part______ ．

The area of the remaining part is A2-B2. A: the area of the remaining part is A2-B2

The side length of a square paper is a centimeter. If you cut the largest triangle from this paper, what is the area of the remaining part in square centimeter?

The remaining area is a * A / 2

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?