Start by creating a circle using elliptical shape tool.
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Enable subtract from shape area from the top bar.
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Create a triangular shape using polygon tool.
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Press Ctrl+T. Right click the layer and select distort. Adjust nodes as shown.
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Duplicate the layer. Fill the layer with another color. Move it below the original layer.
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Press Alt and hit down arrow key multiple times to create the extrude effect.
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Merge all extrude layers. Double click the merged layer and apply layer style as shown.
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Select the original pie layer. Create a gradient as shown. Click the new button in gradient window. This will save the gradient in the presets.
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Double click the layer and apply layer style as shown. Select the gradient you just created in the previous step.
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Apply a nice gradient to the background.
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