letters put together

3. all the sides and interior angels of a polygons are equal
4. an angle of exactly 90 degrees
9. an outside of a shape
10. A pair of numbers which are used to determine the position of a point or a shape in a 2-dimensional plane.
13. A triangle with two congruent sides and congruent base angles.
15. the point where two or more line segments or edges meet

1. lines that cross each other at a 90 degree angle
2. a three dimensional shape
5. the amount of space in a certain 3D object
6. a three dimensional solid object
7. a 2 dimensional shape formed with straight lines
8. a pattern that can be cut in half and folded and made in to a model of a solid shape.
11. A surface on a place
12. a 3D polyhedron with a base of a polygon along with three or more triangle shaped faces that meet at a point above the base.
14. a triangle in which all three sides are in different lengths and all three angles are of different measures