I'm back i need with both of these questions

1st
90+55+x=180 (Angles inside a triangle equal 180 degrees) Solve for x
x = 35 degrees

2nd
2 non-adjacent angle in a triangle is equal to the exterior angles, therefore

25 + x + 15 = 3x + 10    Solve for x
  40 + x = 3x + 10
-10   -1x  -1x  -10

30 = 2x
     2

x = 15 degrees
Therefore angle ABC is x + 15 where x + 15

Therefore angle ABC = 30 degrees

Who ever hand wrote in those degrees/equations didn't really think it out because < A + <B should be greater than 90 not less than 90 

They are similar for their radii, and perimeters have the  same ratio: 2

Step-by-step explanation:

The similarity of circles is proved, when we can compare the ratio, between the two radii and the two perimeter and it is the same.

2. The Circle X, has a radius of 6 and the circle Y has the radius of 3.

So let's do it:

3. Now let's check the Perimeters:

4. In addition to this, we can do this Geometrically, by inserting the Circle Y within the Circle X, and if dilate by the scale factor of 2 we'll have these two circumferences coincide.