Math Crossword Puzzle

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Across
  1. 3. when 2 figures are the same shape and size but are allowed in different positions; 1 shape can become another using turns, flips and/or slides
  2. 5. triangle, a type of triangle in which all the three internal angles of the triangle are acute; a triangle that has all angles less than 90°
  3. 7. a closed solid that has two parallel, usually circular bases connected by a curved surface; one of the most basic of curvilinear geometric shapes
  4. 8. the figure formed by two rays meeting at a common end point; the amount of turn between two lines around their common point
  5. 9. function, a function that "reverses" another function; a function which undoes another function's action
  6. 11. the distance from the center to the circumference of a circle; the line segments of a circle or sphere from its center to its perimeter
  7. 13. triangle, a triangle in which one of the interior angles measures more than 90° degrees; a triangle with one obtuse angle and two acute angles
  8. 17. the distance from one point on a circle through the center to another point on the circle; any straight line segment that passes through the center of the circle and whose endpoints lie on the circle
  9. 18. the trigonometric function that is equal to the ratio of the side adjacent to an acute angle in a right-angled triangle to the hypotenuse; a inverse trigonometric function
  10. 19. a mathematical constant; the ratio of a circle's circumference to its diameter
Down
  1. 1. the longest side of a right-angled triangle; the side of a triangle opposite to a right angle
  2. 2. the reciprocal of the cosine; when used for a angle it is the length of the hypotenuse divided by the length of the adjacent side
  3. 3. the reciprocal of the tangent; when used for a angle it is the length of the adjacent side divided by the length of the side opposite the angle
  4. 4. the reciprocal of the sine; when used for a angle it is the length of the hypotenuse divided by the length of the side opposite the angle
  5. 6. a perfectly round three-dimensional object; a geometrical object in 3 dimensional space that is the surface of a ball
  6. 10. the perimeter of a circle; the complete distance around a circle or a closed curve
  7. 12. the trigonometric function that is equal to the ratio of the side opposite a given angle in a right triangle to the hypotenuse; an inverse trigonometric function
  8. 14. a branch of mathematics that studies relationships between side lengths and angles of triangles; the mathematics division associated with specific functions of angles and their application to calculations
  9. 15. a polyhedron with two parallel faces called bases; a 3 dimensional shape with two identical shapes facing each other
  10. 16. angle, when two straight lines intersect each other at 90˚; one quarter of a full revolution