Well...... Actually, planes would be considered triangles in geometry because triangles are triangles.
In analytical geometry, you equate the equations of the two planes and simplify.
Of course, they are geometric figures.
Geometry.
geometry
geometry
Trigonometry is a branch of geometry which is primarily concerned with the properties and measurement of triangles.
Geometry
Geometry is all about the study of angles, lines, planes, and shapes
Point, line and plane ARE terms from geometry.
In Geometry, you learn about triangles. In Trigonometry you learn even more about triangles.
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They both deal in the properties of triangles