All the parameters of a shape object are displayed in its properties window where you can edit them accurately.
To change the properties of a shape object
Select the object and perform the following operations:
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Open the Object properties: Shape in one of the following ways:
Double-click on the object.
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Press the key combination ALT+Enter.
Click the button in the toolbar.
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Activate the context menu with the right mouse button and choose the command Properties.
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Modify the parameters of the object. To preview the changes, click the Apply button.
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Click on OK.