A. T. S.A =2* AREA OF TRIANGLE +PREIMETER*5.56
 VOLUME=AREA OF *LENGTH[ 5.56]
B. T. S. A=πR{R + SLANT HIGHT }
 VOLUME=1/3*π*R*HIGHT{ 7 }
volume of a sphere is 3 by 4 by R cube and surface area of a sphere is 4 Pi R Square 
 
        
             
        
        
        
Answer:
Step-by-step explanation:
<h3>7) The lengths of the tangent from an external point to a circle are  equal.</h3>
       2x - 1 = x + 10
            2x = x + 10 + 1
            2x = x + 11
       2x -x  = 11
              
 8) Radius : XC
     Chord: CB
    Diameter : AB
   Name of the circle: X    {a circle is named by its center}
 
        
             
        
        
        
Answer: ∠DOB: 48°
Step-by-step explanation:
1. we need an equation first. the sum of all angles (108°, n°, 2n°) is equal to 180°. we can depict this with the equation: 108°+2n°+n°=180°
2. now we can solve for the missing variable, n. 
108°+3n°=180° → subtract both sides by → 3n°=72° → divide both sides by 3 → n=24°
3. now that we know that n=24°, we can solve the value of ∠DOB. we can see that ∠DOB is 2n° which we just plug the number we got for n into the equation. 2*24=48° meaning ∠DOB is 48°
hope this heped! ♡
 
        
                    
             
        
        
        
Answer: C. -102 + (-25.5)