Complementary angles add up to 90.
Say the complementary angle is A. 
Angle A + Angle B = 90
Angle A + 60 = 90
Angle A = 30 degrees
Hope this helps :)
        
                    
             
        
        
        
Answer: 21 cm is the volume 
Step-by-step explanation: multiply 7cm x3 cm
 
        
             
        
        
        
Answer:
Pattern is you add odd numbers, as in 1, 3, 5, 7, 9, etc.
Step-by-step explanation:
11 + 3 = 14
14 + 5 = 19
19 + 7 = 26
26 + 9 = 35
hope this helps