Circle the 128 cm wire into a rectangle so that the length is 18 cm more than the width. How many cm are the length and width?

Circle the 128 cm wire into a rectangle so that the length is 18 cm more than the width. How many cm are the length and width?

Let the length be x and the width be y
X+Y=64
X=Y+18
So x = 41
Y=23

The 128 cm long wire is enclosed into a rectangle, so that the length is 18 cm more than the width. How many cm are the length and width?

Width = (128-18 × 2) △ 4 = 23cm
Length = 23 + 18 = 41 cm

Circle the 128 cm iron wire into a rectangle, and the length is 18 cm more than the width?
forehead

Width (128-18 * 2) * 4 = 23cm
Length 23 + 18 = 41cm
Area 41 * 23 = 943 square centimeters

Use a 40cm long iron wire to form a rectangle. The area of the rectangle is required to be 75 square centimeters (1). What is the width of the rectangle?
Use a 40cm long iron wire to form a rectangle, and the area of the rectangle is required to be 75 square centimeters
(1) What is the width of this rectangle?
(2) Can it be enclosed into a rectangle with an area of 101 square centimeters? If so, explain the enclosure method

It's 5cm wide. It's impossible to encircle a 101 square centimeter rectangle, because a square with equal perimeter has the largest area. A 40cm square can only encircle a 10cm square, with an area of only 100 square centimeters

If a 40cm long wire is surrounded into a rectangle and the length is xcm, the maximum area y will be obtained

Let the length be x, then the width be (20-x)
y=x*(20-x)=-x²=20x
Y max = 100
A: the maximum area y is 100cm & sup2;

Two 40 cm long wires, one is surrounded by a square, and the other is surrounded by a 15 cm long rectangle. What percentage of the square is the area of the rectangle?

Side length of square = 40 △ 4 = 10 (CM)
Area of square = 10 × 10 = 100 (square centimeter)
Width of rectangle = 40 △ 2-15 = 20-15 = 5 (CM)
Area of rectangle = 15 × 5 = 75 (square centimeter)
The area of a rectangle is 75% of that of a square

Use a 16 decimeter long wire to form a circle. The joint is 0.3 decimeter long. What is the area of the circle?

(16-0.3) △ 3.14 △ 2 = 2.5 (decimeter), 3.14 × 2.52, = 3.14 × 6.25, = 19.625 (square decimeter); answer: the area of this circle is 19.625 square decimeter

Use a 16 decimeter long wire to form a circle. The joint is 0.3 decimeter long. What is the area of the circle?

(16-0.3) △ 3.14 △ 2 = 2.5 (decimeter), 3.14 × 2.52, = 3.14 × 6.25, = 19.625 (square decimeter); answer: the area of this circle is 19.625 square decimeter

Use a 16 decimeter long wire to form a circle. The joint is 0.3 decimeter long. What is the area of the circle?

(16-0.3) △ 3.14 △ 2 = 2.5 (decimeter), 3.14 × 2.52, = 3.14 × 6.25, = 19.625 (square decimeter); answer: the area of this circle is 19.625 square decimeter

Use a 16 decimeter long wire to form a circle. The joint is 0.3 decimeter long. What is the area of the circle?

(16-0.3) △ 3.14 △ 2 = 2.5 (decimeter), 3.14 × 2.52, = 3.14 × 6.25, = 19.625 (square decimeter); answer: the area of this circle is 19.625 square decimeter