The total interior angles of a square (or rectangle) = 360°
Each time we add a side (triangle to square, square to pentagon, pentagon to hexagon), we add another 180°. Triangle to square `=180°+180°=360°`
1 

2 

3 

4 


`90°` 
`+` 
`90°` 
`+` 
`90°` 
`+` 
`90°` 
`=` 
`360°` 
The total internal angles of a square = 360°
The total interior angles of a square (or rectangle) = 360°
Each time we add a side (triangle to square, square to pentagon, pentagon to hexagon), we add another 180°. Triangle to square `=180°+180°=360°`
1 

2 

3 

4 


`90°` 
`+` 
`90°` 
`+` 
`90°` 
`+` 
`90°` 
`=` 
`360°` 
The total internal angles of a square = 360°