Calculate the area of the following shadow parts. (1) the radius of small circle is 3cm, and the radius of large circle is 5cm

Calculate the area of the following shadow parts. (1) the radius of small circle is 3cm, and the radius of large circle is 5cm

Just reduce the area of the big circle

If there is a circle, the radius of the big circle is 5cm, and the radius of the small circle is 3cm, what is the area of the circle?

50.24 square centimeter

The radius of the small circle is 1.5cm, the diameter of the big circle is 3cm, the perimeter ratio of the big circle to the small circle is () and the simplest area ratio of the small circle to the big circle is ()

The circumference is directly proportional to the radius or diameter. Therefore, the circumference ratio of the big circle to the small circle is (3 ∶ 1.5 = 2 ∶ 1)
The area is directly proportional to the square of the radius (or the square of the diameter), so the simplest ratio of the area of the small circle and the large circle is (1.5 & # 178;: 3 & # 178; = 1:4)

The diameter of big circle is 6cm, the diameter of small circle is 5cm, what is the perimeter ratio and area ratio of big circle and small circle

Perimeter ratio = diameter ratio
Area ratio = radius & # 178; ratio = diameter & # 178; ratio
Circumference ratio of big circle and small circle = 6:5
Area ratio = (6 / 2) & 178;: (5 / 2) & 178; = = 36:25
"Yzwb I love my family" is very happy to discuss this issue with you