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Criss-Cross Puzzle

Created by Bob Howland

This puzzle includes the names of mathematicians, functions, line-segments, angles, mathematical subjects, sizes and distances.

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        19        
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    21     22          
        23            
24                      
     
  25          

Across
3.The ratio of any circle's circumference to its diameter; is approximately 3.14.
5.A two-dimensional shape with straight sides.
6.A quantity completely specified by a magnitude and a direction.
7.In a right triangle, the length of the opposite side divided by the length of the adjacent side.
9.In a right triangle, the length of the adjacent side divided by the length of the hypotenuse.
12.The distance around a two-dimensional shape.
14.A line that starts at a given point and goes off forever in some direction.
16.The distance around the edge of a circle; a kind of perimeter.
19.Formed by two lines or rays diverging from a common point.
20.Part of the circumference of a circle.
22.The amount of 3-dimensional space an object occupies.
23.French mathematician, creator of ______'s Triangle.
24.Greek mathematician, First to discover the equation a²+b²=c².
25.A line segment from the center to the circumference of a circle or sphere.
Down
1.The numerical value of a number regardless of its sign.
2.In a right triangle, the length of the opposite side divided by the length of the hypotenuse.
4.The branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
8.A line segment passing through the center of a figure, especially of a circle or sphere.
10.The total area of the surface of a three-dimensional object.
11.The size of a surface.
13.The mathematics of the properties, measurement, and relationships of points, lines, angles, surfaces, and solids.
15.The part of mathematics in which letters and other symbols are used to represent numbers and quantities in formulas and equations.
17.Discovered the 'Fibonacci Sequence' of numbers.
18.Any mathematical system of calculation involving the use of symbols.
21.A line segment whose endpoints both lay on the circumference of the circle.

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