The circumference of a semicircular piece of paper is 10.28 decimeters, and its area is______ Square decimeter

The circumference of a semicircular piece of paper is 10.28 decimeters, and its area is______ Square decimeter

According to the stem analysis, we can get: 10.28 ÷ (3.14 + 2),
=10.28÷5.14，
=2 (decimeter),
three point one four × 22 ÷ 2 = 6.28 (square decimeter);
A: its area is 6.28 square decimeters
So the answer is: 6.28

The circumference of a semicircular piece of paper is 10.28 decimeters, and its area is______ Square decimeter

According to the stem analysis, we can get: 10.28 ÷ (3.14 + 2),
=10.28÷5.14，
=2 (decimeter),
three point one four × 22 ÷ 2 = 6.28 (square decimeter);
A: its area is 6.28 square decimeters
So the answer is: 6.28

The circumference of a semicircular piece of paper is 10.28 decimeters, and its area is______ Square decimeter

According to the stem analysis, we can get: 10.28 ÷ (3.14 + 2),
=10.28÷5.14，
=2 (decimeter),
three point one four × 22 ÷ 2 = 6.28 (square decimeter);
A: its area is 6.28 square decimeters
So the answer is: 6.28

A semicircle has a circumference of 5.14 decimeters and an area of () square decimeters

Let the diameter be D, then
3.14d·（1/2）+d=5.14
The solution is d = 2
Then the radius of the semicircle is 1 and the area of the whole circle is 3.14
So the area of the semicircle is 1.57
(π is 3.14)

The circumference of a circle is 12.56 decimeters. How many decimeters is the circumference of a semicircle and how many square decimeters is the area

Radius = 12.56 ÷ 3.14 ÷ 2 = 2 decimeters
Perimeter = 12.56 ÷ 2 + 2 × 2 = 10.56 decimeter
Area = 2 × two × three point one four × 1 / 2 = 6.28 square decimeter

If the circumference of a semicircle is 20.56dm, how many square decimeters is the area of this semicircle?

Let the radius of this semicircle be x decimeters
3.14*2X/2+2X=20.56
3.14X+2X=20.56
5.14X=20.56
X=4
Area: 3.14 * 4 * 4 = 50.24 square decimeters