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2 regular pentagons have radii of 5cm and 7cm What is the ratio of their areas?
Wiki User
∙ 15y ago
Given the radius R (distance from the center to a vertex), the area of a regular pentagon is given by:
R25sin(2pi/5)
----------------
2
So, since the rest of the formula is a constant, to determine the ratio, you just need the ratio of:
52 : 72
= 25 : 49, or 1 : 1.96, or (backwards) 0.51 : 1
Wiki User
∙ 15y ago
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What is the relationship between area of a circle and its radius squared for a series of circles with large increasingly large radii?
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What is the similarity ratio and the ratio of the perimeters of two regular octagons with areas of 18in2 and 50in2?
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The ratio between the radii of two spheres is 9 2 What is the ratio of their volumes?
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What is the ratio for the volumes of two similar spheres given that the ratio of their radii is 27?
If the ratio is 2 : 7 then the volumes are in the ratio 8 : 343.
What is the ratio for the volumes of two similar spheres given that the ratio of their radii is 2 7?
It is 8 : 343.
