We can get the total by calculating the angle of each vertex. First, we have four vertices, and each vertex has three sides. Therefore, the total * * * has 4 times 3= 12 angles. However, this calculation will repeatedly calculate some angles, because the angle of each vertex is calculated twice (once for each edge). Therefore, we need to divide these 12 angles by 2 to get \dfrac{ 12}{2} =6 angles. Therefore, a * * * has six angles.

In our daily life, mathematics is everywhere. From shopping checkout to calculating distance, we all need to use mathematics. And the basis of mathematics is counting. Today, let's count together and explore the mystery of mathematics.

First of all, we must understand what counting is. Simply put, counting means that we count the numbers one by one with our fingers or objects. For example, if we have a basket of apples, we can count the number of apples one by one. This is the most basic count.

Then, we can further explore the application of counting. In mathematics, we often need to calculate some complicated problems, such as sum, difference, product and quotient of two numbers. These seemingly complicated problems are actually solved by counting. For example, if we want to calculate 5+3, we can count one finger first, then three fingers, and finally put two fingers together to get 8, which is the result of 5+3.

In addition, counting can help us understand some abstract concepts. For example, we can understand the concepts of "how much" and "how much is missing" by counting. For example, if we have 10 apples, we will know how many apples are left after eating three. Generally speaking, counting is the basis for us to understand and master mathematics. Only by mastering counting can we better understand and solve more complicated mathematical problems. So, let's count together and explore the mystery of mathematics!