Brianchon's theorem

例句：

1. 1. The theoremstates that the sum of the angles in a triangle is always 180 degrees.
   这个定理表明三角形内角之和总是180度。
2. 2.In mathematics, Brianchon's theorem is used to prove the existence of prime numbers.
   在数学中，布莱恩顿定理被用来证明素数的存在。
3. 3. This theorem has been proven to be true for all non-zero real numbers.
   这个定理对所有非零实数都已被证明是正确的。