Radii of circles are equal. congruent concentric coplanar overlapping

A. Radii of congruent circles are equal.

Step-by-step explanation:

We have been given an incomplete sentence. We are supposed to fill in the blank from our given choices.

Sentence:

Radii of circles are equal.

We know that radius of a circle is distance from the center circle to any point on the circle.

The radii of two circles will be equal, if and only if, both circles are congruent, therefore, the correct choice is opton A.

geometry: triangles

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lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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