Sophia's Geometry Crossword Puzzle

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Across
  1. 1. Half of a circle where the endpoints of the arc are the diameter. This measure 180 degrees.
  2. 5. Has congruent corresponding parts which means there are matching angles and sides. When you name these, the corresponding verticals have to be in the same order.
  3. 7. When the hypotenuse and the leg are congruent to the hypotenuse and leg of a second triangle. The triangle has to be right triangle for this to work.
  4. 9. The amount of space inside a circle. The formula to find this is (pi)(r^2).
  5. 12. Law used when given 2 sides and it's included angle (SAS) or the lengths of all the sides of the triangle (SSS).The formula is c^2=a^2+b^2-2(a)(b)(cosc).
  6. 15. 2 angles with a common vertex and can't overlap. There are no common interior points.
  7. 17. The sum of the areas of all the faces that enclose a solid. The faces include the bases and the remaining surfaces.
  8. 19. Law used to solve missing sides or angles for a triangle. Things to make sure you know when using this is side a faces angle A, side b faces angle B, and side c faces angle C.
  9. 20. Only occurs for a right triangle where the two legs equal the hypotenuse. The formula is a^2+b^2=c^2.
  10. 21. These can be clockwise or counterclockwise. The 90 degree turn for the preimage is (x,y) and the image becomes (-y,x) after the turn.
Down
  1. 2. If two lines and a transversal form corresponding angles that are congruent, then the lines are parallel. This is a way to prove lines are parallel.
  2. 3. The sum of the area of lateral faces. This does not include bases.
  3. 4. Shows two triangles are congruent if both have 2 sides and an included angle that are congruent. The included angle is between the 2 sides.
  4. 6. A polygon that has 5 sides and 5 angles that are congruent. The sum of the interior angles is 540 degrees.
  5. 8. A region bounded by the arc of a circle and the radius to the endpoints of the arc. The smaller area of this is called the minor sector and the larger part is called the major sector.
  6. 9. An angle that is formed between the horizontal angle and your line of sight. When you are looking upward at objects.
  7. 10. The distance around a circle. The formula is c=(2)(pi)(r) or c=(pi)(d).
  8. 11. All sides are congruent and all angles are congruent. The formula for the measure of this is 180(n-2)/n.
  9. 13. A straight line that only touches one point of the circle. The point is the point of tangency.
  10. 14. 2 angles that measure 180 degrees. To find one of the angles you subtract the given angle from 180.
  11. 16. An angle that is formed between the horizontal angle and your line of sight. When you are looking downward at objects.
  12. 18. When the image is the same size as the preimage. This is also known as rigid motion.