帮你计算环不同的参数，环形对象。
Annulus Calculator Pro helps you to quickly and easily calculate different parameters of the ring shaped object. Automatic & accurate calculations.
Key Features:
• 15 types of calculations/inputs to choose from.
• Calculated values and results can be shared to social media, mail, messages and other sharing apps.
• Automatic calculation of values based on inputs.
• Clear display of formulas.
• Specific unit options are provided.
• Professional user interface.
• Available in English, Français, Español, Italiano, Deutsch, Português & Nederlands.