The interior angles of a triangle always add up to 180 degrees. If you make one angle bigger, another angle will become smaller: The exterior angles of a triangle always add up to 360 degrees: In every triangle, the shortest side is always opposite the smallest interior angle. The longest side is always opposite the largest interior angle. âOppositeâ means that the side does not touch the point of the angle on either end. Equilateral triangles must have three angles of 60 degrees each, and all triangles with three 60 degree angles are equilateral.
Neuroblastoma is a very rare type of cancerous tumor that almost always affects children. 1  Neuroblastoma develops from nerve cells in the fetus called neuroblasts. 2  Usually, as a fetus matures and after birth, the neuroblasts develop normally. 3  Sometimes they become cancerous, causing neuroblastoma.
1 How genes and the environment affect the brain. 2  The basic structure of the brain. 3  How different parts of the brain communicate and work with each other.  How changes in the brain can lead to mental disorders, such as depression.