Masking With Paste Inside
The triangles around the circle extend outside the circle. You want them contained within the circle. The problem is that the circle is curved around the edges, and the edges of the triangles are straight. To fit the triangles within the curve, you'll use a masking method called Paste Inside. Think of the circle as if it were a cookie cutter and you could use it to cut through the triangles. Then the cut edges would be curved, and the triangles would fit precisely within the circle. There are other ways to create a mask that you will learn in later lessons.
Select all the triangles.
You can Shift-click each triangle to select it; or an easier way is to choose Select > Select All. Select All will also select the circle, which you don't want selected. Hold down Shift and click in the middle of the circle to deselect it.
When you hold down Shift and click an object, you alternately select or deselect
The document title bar displays the number of selected objects; 10 in this example.
Choose Edit > Cut, select the circle, and then choose Edit > Paste Inside.
The triangles are pasted within the circle. Because you applied the Inner Bevel effect to the circle, the triangles take on that beveled look as well.