The length of the arc , as in the picture, is 22 cm and O is the center of the circle. The perimeter of the circle (circumference) is:

a) 990 cmb) 67 cmc) 176 cm
d) 88 cme) none of these answers

show the answer

 

What is the radius of the following circle which center is O, given that:
AB = 3x - 3 and OA = x + 3.
show the answer

 

Find x in the following cases:
a) s is perpendicular to b) and are tangent segments to the circle
show the answer

 

The circles in the picture are externally tangent. The distance between the centers is 28 cm and the difference between their radii is 8 cm. Find the length of each radius.
show the answer

 

Knowing that O is the center of the circle, find x in the following cases:
a) b)
show the answer