A square sheet iron with side length of 6 decimeters is processed into the largest circle. The circumference of the circle is () and the area is ()

A square sheet iron with side length of 6 decimeters is processed into the largest circle. The circumference of the circle is () and the area is ()

A square sheet iron with a side length of 6 decimeters is processed into the largest circle with a circumference of (18.84 decimeters) and an area of (28.26 square decimeters)

In the figure below, the area of the trapezoid is 13.5 square decimeters, the bottom is 5 decimeters, and the median line is 4

I know. It's the area of shadow, right~
13.5 △ 4.5 = 3 (decimeter) 4.5 × 2-5 = 4 (decimeter) 4 × 3 △ 2 = 6 (square decimeter)
Accurate answer Oh ~ hope to adopt~

The trapezoid has an area of 8.1 square decimeters and a height of 90cm. Its median line is () cm

The trapezoid has an area of 8.1 square decimeters and a height of 90cm. Its median line is (9) cm
Median line = 2x area / height / 2 = 8.1 x 100 / 90 = 9

The circumference of a circular sheet iron is equal to that of a rectangular sheet iron. It is known that the length of the rectangular sheet iron is 10 decimeters and the width is 5.7 decimeters. What is the radius of the circular sheet iron
Primary school grade 6 Volume 2 "mathematics independence" page 12 question 2

Circumference of rectangle (circumference of circle) = (10 + 5.7) × 2 = 31.4 decimeters
Radius of round sheet iron = 31.4 △ 3.14 △ 2 = 5 decimeters

The circumference of a circular sheet iron is equal to that of a rectangular sheet iron. It is known that the length of the rectangular sheet iron is 10 decimeters and the width is 5.7 decimeters. What is the radius of the circular sheet iron
detailed

(10 + 5.7) × 2 ﹣ 3.14 ﹣ 2 = 5 decimeters

The circumference of a round sheet is equal to that of a rectangular sheet. It is known that the length of the rectangular sheet is 10 DM and the width is 5.7 DM. What is the diameter of the circular sheet
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(10x2 + 5.7x2) △ 3.14 = 31.4 △ 3.14 = 10 decimeters

A rectangular sheet of iron is 2 decimeters long and 15 centimeters wide. What is its perimeter and area?

70cm 300cm²

Cut out the largest circle from a rectangular sheet of iron 10 decimeters long and 8 decimeters wide. The circumference of the circle is () and the area is () of leftover materials
The area is ()

Cut the largest circle from a rectangular sheet of iron 10 decimeters long and 8 decimeters wide,
The circumference of this circle is (25.12 decimeters),
The area is (50.24 square decimeters),
The area of leftover materials is (29.76 square decimeters)

A semicircular flower bed is 20.56 meters in circumference. What's its area
As the title!

2r+3.14r=20.56
r=4
Area = 3.14 * 4 ^ 2 = 50.24

A semicircle flowerbed has a circumference of 15.42 meters. How many square meters is the area of this semicircle flowerbed?

Radius 15.42 △ 3.14 + 2 = 3M
Area 1 / 2x3x3.14 = 14.13m2