Trigonometry crossword

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Across
  1. 2. m=y1-y2/x1-x2
  2. 3. angle An angle that measures less than 90° and greater than 0°.
  3. 4. number The set of all rational and irrational numbers.
  4. 8. Having the same value.
  5. 9. triangle A triangle having an interior right angle.
Down
  1. 1. The longest side of a right triangle; the side opposite the right angle.
  2. 3. The number of square units needed to cover a surface.
  3. 5. The horizontal number line on a rectangular coordinate system.
  4. 6. A closed plane figure with all points of the figure the same distance from the center. The equation for a circle with center (h, k) and radius r is(x - h)2 + (y - k)2 = r2
  5. 7. A relation from A to B is any subset of the cross product of A and B.