# Are all circles similar Why or why not? ### Are all circles similar Why or why not?

Similarity is a quality of scaling: two shapes are similar if you can scale one to be like the other, like these triangles ABC and DEF. Since all circles are of the same shape (they only vary by size), any circle can be scaled to form any other circle. Thus, all circles are similar!

### How do you prove all circles are similar?

Take any two circles, and slap some Cartesian Coordinates on them, such that the first is at the origin. Translate the second circle to the origin, then dilate it until the radii match. Thus the pair of circles is similar.

### Can any two circles be similar?

Because a circle is defined by its center and radius, if two circles have the same center and radius then they are the same circle. ... This proves that in general, all circles are similar.

### Which statement best explains why all circles are similar?

Answer: All circles have the same ratio of circumference to diameter. Step-by-step explanation: All circles have the same ratio of the circumference to the diameter.

### Are all circles similar or congruent?

We know that congruent means the same shape but different size. Different circles may have the same or different sizes. All circles are both similar and congruent. ... The diameter of the circle divides it into two equal parts.

### What is true of all circles?

All circles have a diameter, too. The diameter of a circle is the segment that contains the center and whose endpoints are both on the circle. The length of the diameter is twice that of the radius. Therefore, all diameters of a circle are congruent, too.

### Are two rectangles always similar?

Are all rectangles similar? No, all rectangles are not similar rectangles. The ratio of the corresponding adjacent sides may be different. For example, let's take a 1 by 2 rectangle and take another rectangle with dimensions 1 by 4.

### What is true for all circles?

All circles have a diameter, too. The diameter of a circle is the segment that contains the center and whose endpoints are both on the circle. The length of the diameter is twice that of the radius. Therefore, all diameters of a circle are congruent, too.

### Which pair of polygons is similar?

Similar polygons are two polygons with the same shape, but not the same size. Similar polygons have corresponding angles that are congruent, and corresponding sides that are proportional.

### Are 2 circles always congruent?

If the two given circles have the same radius the circumference hence are the same as the circumference is equal to 2πr, where r is the radius of the circle. ... Here f and g are the radius having different values. ∴ For the statement two circles are always congruent, it is false.

### Why are all circles the same size and shape?

Since all circles are just scaled versions of each other with the same “angles”, or none there of (which ever way you want to view them), then they would be considered similar by similar angles theorem. Ovals on the other hand (or ellipses) can vary in size AND shape. Because their difference in shape, they will not be considered similar.

### Is it true that all circles have the same angles?

Yes. Since all circles are just scaled versions of each other with the same “angles”, or none there of (which ever way you want to view them), then they would be considered similar by similar angles theorem.

### Can you have two circles with the same center?

You should now have two concentric circles (circles with the same center). Now perform a dilation (resizing) of one circle, centered on the shared center, until the circles overlap. The circles will always overlap no matter what size they are; thus, they are similar. Originally Answered: Are all circles similar? Yes.

Transcript Ex 6.