Question

Найди длину окружности и площадь круга диаметром 8 см Прошу помогите плиз

Answer 1

Пошаговое объяснение:

D = 8 см

π = 3,14

С = ? см

S = ? см²

С = πD

C = 3,14 * 8 = 25,12 см

S = πR²

R = D : 2

R = 8 : 2 = 4см

S = 3,14 * 4² = 3,14 * 16 = 50,24 см²

Answer 2

Calculating the Circumference and Area of a Circle with a Diameter of 8 cm

To find the circumference and area of a circle with a diameter of 8 cm, we can use the following formulas:

Circumference (C) of a Circle: The circumference of a circle can be calculated using the formula: \[ C = \pi \times d \] Where: - \( \pi \) is a constant approximately equal to 3.14159 - \( d \) is the diameter of the circle

Area (A) of a Circle: The area of a circle can be calculated using the formula: \[ A = \pi \times r^2 \] Where: - \( \pi \) is a constant approximately equal to 3.14159 - \( r \) is the radius of the circle, which is half the diameter (\( r = \frac{d}{2} \))

Calculations

Diameter (d): 8 cm

Radius (r): \( \frac{8}{2} = 4 \) cm

Circumference (C): \[ C = \pi \times 8 \] \[ C \approx 3.14159 \times 8 \] \[ C \approx 25.13272 \]

Area (A): \[ A = \pi \times 4^2 \] \[ A \approx 3.14159 \times 16 \] \[ A \approx 50.26544 \]

Therefore, the circumference of the circle is approximately 25.13 cm, and the area of the circle is approximately 50.27 square cm.

I hope this helps! If you have any further questions, feel free to ask.