Step-by-step explanation:
The circumference of a circle is the linear distance of a circle's edge.
 
        
             
        
        
        
Answer:
90 degrees 
Step-by-step explanation:
 If two angles are supplementary they are a linear pair which means they form a straight line, and if you know a straight line equals 180 degrees which is the total degrees of a triangle. 
 Now if you have two supplementary angles and they are congruent that means not only are they right angles but its half of 180 so you divide these pair of 2 by 180 giving you your total of 90 degrees. 
 Have a nice rest of your day !
 
        
             
        
        
        
The expression -> 4 • 2 - 3
the answer to the expression would be 5
        
             
        
        
        
Answer:
75
Step-by-step explanation:
Since the ratio between flamingos and chachalacas is 2:1, we see that the ratio of flamingos to chachalacas to parrots to herons is 10:5:7:3. The sum of these numbers is 25, so every 'ratio number' gets 375/25 = 15 animals. So the number of chachalacas is 15 * 5 = 75.