La description de Arithmetic

This program is designed for those who want to learn interesting mathematical tricks to speed up the calculating. These tricks will help solve part of the mathematical problems and tasks much faster than classical. Will also be helpful to those who want to hone basics such as the multiplication table.
When you learn these mathematical tricks, you'll be able to show off your skills to friends and prove to them that you have a talent for mathematics. New skills you can use in the store, at school, at college, at work - wherever thanks to quick calculation skills can save a lot of precious time.
Square
Rectangle
Circle
Triangles
Parallelogram
Trapezoid
Cube
Cylinder
Sphere
Cone
All in one
Geometric Symbols
Special Angles
Trigonometric Function Values in Quadrants II, III, and IV
The Unit Circle
Angle Addition Formulas
Double Angle Formulas
Half Angle Formulas
Power Reducing Formulas
Product‐to‐Sum Formulas
Cofunctions Formulas
Law of Sines
Law of Cosines
Law of Tangents
Pythagorean Identities (for any angle θ)
Mollweide’s Formula