Assuming the smaller sphere is the image of the larger sphere after transformation (based on the order of the radii): the scale factor is 4/12 = 1/3
1 : 1.25
The radius of a circle is one-half of the circle's diameter. So if the radius is 12 inches, the diameter is 24 inches.
To find the new area, you have to multiply the original area by the square of the scale change. For example, you have a rectangle with adjacent sides of 3 and 4. Another rectangle has the same dimensions but with triple the scale. The original rectangle's area is 12. Multiply that by 9, which is the square of the new scale, and you get an area of 108. That matches up with the area of the new rectangle, which has adjacent sides of 12 and 9.
The diameter is twice the radius so the answer is 12 millimeters.
Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12
12
12
It is: 21/12 = 7/4
It is: 2 to 3
It is: 3 to 2
12
It is: 2 to 3
Multiply each dimension by the scale factor:9 x 12 → (9 x 2.5) x (12 x 2.5) = 22.5 x 30
Convert to same units, then can cancel out units: 1 ft = 12 in → 1 in : 4 ft = 1 in : 4 x 12 in = 1 in : 48 in = 1 : 48 So the scale factor is 48.
12r = p
If you mean: 8 12 16 and 10 15 20 then it is 4 to 5
1 : 1.25