The diameter is 6cm. Find the area of the circle

The diameter is 6cm. Find the area of the circle

It's so simple! We've learned four operations. They're all from grade six. Shake hands! 6 divided by 2 = 3cm, 3 times 3.14 = 9 times 3.14 = 28.26. You must give them to me. Don't owe me

The area ratio of the two circles AB is 4:25. The difference in radius is 6cm. What is the area of circle a in square centimeter?

a²π:b²π=4:25
a:b=2:5
5a=2b
b=a+6
5a=2a+12
3a=12
a=4
4²π=50.24
A: the area of a circle is 50.24 square centimeters

A. The area ratio of B is 4:25, the difference of radius is 6cm, and the area of a and B is () square centimeter

Let the radius of a and B be r and R respectively; the area is proportional to the square of the radius, so r = (5 / 2) r, and R-R = 6, then r = 10 and R = 4 can be obtained; the area of a and B can be obtained

If the radius of a circle is a centimeter and 2: a = A: 3, the area of the circle is () square centimeter
A. 23 π B. 6 π C. 6D

2: A = A: 3, a × a = 2 × 3, A2 = 6; therefore, the area of this circle is 6 π