We will match them by using the following expression:
Here ia represents the sum of all internal angles and n the number of sides of the shape.
*Now we solve for each shape in order:
1st. 4 sides:
So, the first shape has a sum of internal angles that equals 360°.
2nd. 5 sides:
So, the second shape has a sum of internal angles that equals 540°.
3rd. 6 sides:
So, the third shape has a sum of internal angles that equals 720°.
4th. 7 sides:
So, the fourth shape has