Geometry
# Composite Figures

In the regular star polygon above, \(\text{___________}.\)

5 unit circles are placed with their centers on a square grid. What is the total green area?

**Note:** The centers of the circles are \( (-1, 1), (1,1), (0,0), (-1,-1), (1,-1) \).

The above shows a rectilinear figure (all its interior angles are either \(90^\circ\) or \(270^\circ\) only).

Calculate the perimeter of this figure.

Within the orange square, there are 4 circles each with radius 1. What is the area of the green region in the center?

Hint: Connect the centers of the circles.

I cut out 4 rectangles from each of its corners as shown above.

What is the perimeter of this new figure?

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