geometry words

2. Measures the space inside a shape.
4. The set of points in a plane equidistant form a given point.
6. Cut in half, all three interior angles of the triangle with bisector lines.
10. The point where all three altitudes of the triangle intersect.
12. Less than 90 degrees.
13. 90 degrees.
14. A line with a single endpoint (or point of origin) that extends infinitely in one direction.
15. The highest point; the top or apex.
16. A four-sided polygon which has it's all sides equal in length and the measure of the angles are 90 degrees.

1. A quadrilateral with two pairs of parallel sides.
3. The distance from the center of the circle to any point on it's circumference.
5. 0-dimensional mathematical object which can be specified in -dimensional space consisting of coordinates.
7. The distance that surrounds a circle.
8. Center of mass of a two-dimensional planar lamina or a three-dimensional solid.
9. A polygon with three sides having three vertices.
11. More than 90 degrees.