Add up the three sides.
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in order to find the perimeter of a shape add up all the sides measurements
How do you find the apex of a triangle?
You find the orthocenter by constructing the altitudes from the vertices in a triangle. If the triangle is obtuse, the orthocenter will fall outside the triangle. If the triangle is acute, the orthocenter will fall on the inside of the triangle. If the triangle is a right triangle, the orthocenter will lie on a vertix.
There is no such thing as a 3D triangle.
The perimeter of a triangle is the distance around it. Add the lengths of the three sides to find the perimeter.