∠a is 35° because of vertical angle congruence. ∠b is 55° because one angle is right, so the other two have to add up to 90°, and 90°-35°=55°. ∠c is 110° because it creates a straight angle (180°) with the 70° angle, and 180°-70°=110°.
        
             
        
        
        
Answer:
for which problems if it is all the ones you haven't done yet then say that.
Step-by-step explanation:
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In cylindrical coordinates, we have  , so that
, so that

correspond to the upper and lower halves of a sphere with radius  . In spherical coordinates, this sphere is
. In spherical coordinates, this sphere is  .
.
 means our region is between two cylinders with radius 1 and
 means our region is between two cylinders with radius 1 and  . In spherical coordinates, the inner cylinder has equation
. In spherical coordinates, the inner cylinder has equation

This cylinder meets the sphere when

which occurs at

where  . Then
. Then  .
.
The volume element transforms to

Putting everything together, we have

 
        
             
        
        
        
Answer:
the awnser should be. 165