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# Geometry: Let's Eat!

9/25/14

### 1. Square

-a plane figure with four equal straight sides and four right angles.

### 2. Circle

a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).

### 3. Triangle

a plane figure with three straight sides and three angles.

### 4. Intersecting Lines

Two or more lines that meet at a point

### 5. Cone

a solid or hollow object that tapers from a circular or roughly circular base to a point.

### 6. Cylinder

a solid geometric figure with straight parallel sides and a circular or oval section.

### 7. Sphere

a round solid figure, or its surface, with every point on its surface equidistant from its center.

### 8. Prism

a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.

### 9. Octagon

a plane figure with eight straight sides and eight angles.

### 10. Pyramid

an object, shape, or arrangement in the form of a pyramid.

### 11. Plane

a flat surface on which a straight line joining any two points on it would wholly lie.

### 12. Cube

a symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares.

### 13. Rhombus

a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.

### 14. Parallelogram

a four-sided plane rectilinear figure with opposite sides parallel.

### 15. Rectangle

a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.

### 16. Pentagon

a plane figure with five straight sides and five angles.

### 17. Angle Bisector

A line that splits an angle into two equal angles.

angles that have a common vertex and a common side.

### 19. Vertical Angles

each of the pairs of opposite angles made by two intersecting lines.

### 20. Semicircle

a half of a circle or of its circumference.

### 21. Point

An exact location. It has no size, only position.

### 22. Perpendicular Lines

two lines that meet at a right angle

### 23. Diameter

a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

### 24. Acute Angle

An angle that measures less than ninety degrees but more than zero degrees.

### 25. Congruent Circles

Two circles are congruent if they have the same diameter.