Question

Срочно гений математики помогите..... Длина окружности круга равна 25,12 см. Наидите площадь круга.28,06 см250,24 см236,56 CM244,26 см2Площадь круга равна 314 см2. Найдите длину окружности круга.125,6 CM62.8 см94,2 см78,5 CMРадиус колеса равен 5 см. Какое расстояние проедет колесо, если совершит 5 оборотов?314 CM15,7 CM31,4 CM157 CMДиаметр колеса равен 20 см. Какое расстояние проедет колесо, если совершит оборот на 3600 градусов.628 CM504 CM812 CM1024 CMКолесо с радиусом 40 см проехало расстояние 12,56 м. Сколько оборотов совершило колесо?84510Металлический диск совершив 20 оборотов проехал расстояние 1256 см. Найдите площадь металлического диска.314 CM262\ см2157 CM21256 см2​

Answer 1

Ответ:

1е 50.24(Посм.конец

Пошаговое объяснение:

1. Площадь круга: пР²

Длина окружности:2ПР

Чтоб найти Р нужно Ответ : на 2П(6.28)

Р=25.12/6.28==4

Р=4

Используем формулу и получаем:

S=3.14*16

S=50.24 (Второй вариант)

Это ток первое, но я сейчас дальше буду решать

Answer 2

Ответ:

С=25.12см

S=?

C=2π*r

S=πr²

r=C/2π

r=25.12/6.28=4см

S=3.14*4²=50.24см²

S=314см²

r²=314÷3/14=100

r=10см

С=2*3.14*10=62.8 см

С=2*3.14*5=31.4см

31.4*5=157см

С=2*3.14*10=62.8см

62.8*10=628см

С=2*3.14*40=251.2см

12.56м=1256см

1256÷251.2=5 оборотов

С=1256÷20=62.8см

r=62.8/6.28=10cм

S=3.14*10²=314см²

Пошаговое объяснение:

Answer 3

Calculation of Circle's Area and Circumference

To find the area and circumference of a circle, we need to know the radius or diameter of the circle. The formulas for calculating the area and circumference are as follows:

- Area of a Circle: A = π * r^2, where A is the area and r is the radius of the circle. - Circumference of a Circle: C = 2 * π * r, where C is the circumference and r is the radius of the circle.

Let's calculate the area and circumference based on the given information.

1. Length of the circumference of the circle is 25.12 cm. - To find the radius, we can use the formula C = 2 * π * r and rearrange it to solve for r: r = C / (2 * π). - Substituting the given value, we have r = 25.12 cm / (2 * π) ≈ 3.999 cm. - Now, we can calculate the area using the formula A = π * r^2: A ≈ π * (3.999 cm)^2 ≈ 50.27 cm^2.

2. Area of the circle is 314 cm^2. - To find the radius, we can rearrange the formula A = π * r^2 to solve for r: r = √(A / π). - Substituting the given value, we have r = √(314 cm^2 / π) ≈ 9 cm. - Now, we can calculate the circumference using the formula C = 2 * π * r: C ≈ 2 * π * 9 cm ≈ 56.55 cm.

3. Radius of the wheel is 5 cm and it makes 5 revolutions. - To find the distance traveled by the wheel, we can use the formula D = C * n, where D is the distance, C is the circumference, and n is the number of revolutions. - Substituting the given values, we have D = 2 * π * 5 cm * 5 ≈ 157.08 cm.

4. Diameter of the wheel is 20 cm and it makes a full revolution (360 degrees). - To find the distance traveled by the wheel, we can use the formula D = π * d, where D is the distance and d is the diameter of the circle. - Substituting the given value, we have D = π * 20 cm ≈ 62.83 cm.

5. Wheel with a radius of 40 cm traveled a distance of 12.56 m. - To find the number of revolutions, we can use the formula n = D / C, where n is the number of revolutions, D is the distance, and C is the circumference. - Converting the distance to centimeters, we have D = 12.56 m * 100 cm/m ≈ 1256 cm. - Substituting the given values, we have n = 1256 cm / (2 * π * 40 cm) ≈ 10 revolutions.

6. A metallic disk made 20 revolutions and traveled a distance of 1256 cm. - To find the area of the metallic disk, we can use the formula A = π * r^2, where A is the area and r is the radius of the circle. - To find the radius, we can use the formula C = 2 * π * r and rearrange it to solve for r: r = C / (2 * π). - Substituting the given values, we have r = 1256 cm / (2 * π * 20) ≈ 10 cm. - Now, we can calculate the area using the formula A = π * r^2: A ≈ π * (10 cm)^2 ≈ 314.16 cm^2.

Please note that the calculations are approximations and rounded to two decimal places for simplicity.