The radius of two circles are r and 4r what will be the ratio of their Area and perimeter.

The ratio of the radius of two circles is 4:5. Find the ratio of their areas.

The ratio between the area of two circles is 4:7. What will be the ratio of their radii ?

If the radius of a circle is tripled, what is the ratio of the area of half the original circle to the area of the whole new circle? (Area of a circle =pir^(2) , where r = radius)

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the radius of these two circles.

The ratio of areas of two circle is 4:1 , then the ratio of their radius is

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the ratio of the areas.

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the ratio of the circumference.

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the ratio of the diameters.

The areas of two circles are in the ratio 9:4, then what is the ratio their circumference?

In the diagram to the right , the circle with center O is inscribed in equilateral triangle BCD. If the radius of the circle is 4, what is the ratio of the perimeter of triangleBCD to the area of triangleBCD ?