Miss lees class collected 3 more ball because 21-18 is 3. if i collect 18 balls and my friend collects 21 balls and then we add 21+18 we get 39 and then we put 39 in 13 equal groups we have 3in each group that is why they collected 3.
21-18=3
add 21+18=39
put in equal groups
divide 39 with 3 get thirteen make equal group get 3 in each group
*21-18=3
*21+18=39
*39 divided with 3=13
* 3 in each group
*Answer 3
Answer:
Internal angle = 
Number of sides = 18
Step-by-step explanation:
Given that:
We have a regular polygon with number of sides unknown.
Measure of an exterior angle of the polygon = 
To find:
Measure of an interior angle and the number of sides of the polygon?
Solution:
Let us have a look at the relation of sum of external angles.
Sum of one internal angle and its corresponding external angle = 
Internal angle + external angle = 
Internal angle =
-
= 
Sum of all the external of a regular polygon = 
All the external angles will be equal because it is a regular polygon.
Let the number of sides = 
Therefore,

Therefore, the answers are:
Internal angle = 
Number of sides = 18
Answer:
r = 5
Step-by-step explanation:
r³ = 125
r × r × r = 125
5 × 5 × 5 = 125
25 × 5 = 125
125 = 125