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Q: How do you find the ratio of two areas?

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The ratio is 16 to 81.

I guess you mean the ratio of the areas; it depends if the 2 rectangles are "similar figures"; that is their matching sides are in the same ratio. If they are similar then the ratio of their areas is the square of the ratio of the sides.

1:2

False: Ratio areas= 16 : 64 = 1 : 4 Ratio of sides = sqrt(ratio of areas) = 1 : 2

area of triangle 1 would be 16 and the other triangle is 9 as the ratio of areas of triangles is the square of their similar sides

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You calculate the areas of two shapes and then divide one area by the other to find the ratio of their areas.

7:3

If you mean ratio then I don't quite understand the question.. but if you mean RADIUS Then you take the diameter and divide it by two. ============================================== There's no such thing as the ratio of circles. You can find the ratio of their diameters, the ratio of their radiussesses, and the ratio of their areas. -- The ratio of their diameters is: One diameter divided by the other one. -- The ratio of their radiusses is the same number as the ratio of their diameters. -- The ratio of their areas is the square of that same number.

The ratio is 16 to 81.

If the ratio of similarity is 310, then the ratio of their area is 96100.

The ratio of their perimeters will be 3:1, while the ratio of their areas will be 9:1 (i.e. 32:1)

If the lengths are in the ratio 3:5, then the surface areas are in the ratio 9:25.

Area = length x length Therefore the ratio of areas of two similar objects is the square of the ratio of lengths. Lengths - 1 : 41 Areas - 12 : 412 = 1 : 1681

I guess you mean the ratio of the areas; it depends if the 2 rectangles are "similar figures"; that is their matching sides are in the same ratio. If they are similar then the ratio of their areas is the square of the ratio of the sides.

The ratio of their surface areas is 42 to 52 or 16 to 25

The ratio of their surface areas is the square of the ratio of the lengths. Since the ratio of the lengths is 4-1, then the ratio of the surface areas is 4^2-1^2 or 16-1.

A ratio is a property of two or more numbers. It is not possible to find the ratio of a single number.

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