1 Create a triangle by using the Polygon tool. Draw the polygon and while drawing, hold the down arrow to reduce the number of sides. Fill it with a lighter green and add a heavy stroke of a darker green. Use the Stroke panel to round the corners of the stroke.
2 Duplicate the first triangle, then increase the size and place it below the first triangle. Do not scale the stroke and effects while sizing; open the Transform panel and make sure Scale Stroke and Effects is off before you scale.
3 Choose Object > Blend > Blend Options. Set the spacing to Specified Steps and choose 3 steps. Click OK.
4 Choose Object > Blend > Make to blend the shapes together.
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5 Select the blended shapes ...
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