The ACT Math Test: Geometry, List 1

Review terms and concepts that are likely to appear on the ACT Math Test.
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Full list of words from this list:

words only definitions & notes
  1. acute
    (of an angle) less than 90 degrees
  2. obtuse
    of an angle, between 90 and 180 degrees
  3. altitude
    the perpendicular distance from the base of a figure
  4. angle
    the space between two lines or planes that intersect
  5. arc
    a continuous portion of a circle
  6. triangle
    a three-sided polygon
  7. isosceles
    (of a triangle) having two sides of equal length
  8. scalene
    having three sides of different lengths
  9. hypotenuse
    the side of a right triangle opposite the right angle
  10. parabola
    a symmetrical, approximately U-shaped curve
  11. hyperbola
    an open, symmetrical plane curve with two branches
  12. bisect
    cut in half or cut in two
  13. chord
    a straight line connecting two points on a curve
  14. circumference
    the length of the closed curve of a circle
  15. circumscribe
    draw a geometric figure around another figure
  16. congruent
    coinciding when superimposed
  17. degree
    a measure for arcs and angles
  18. tangent
    a line that touches a curve at only one point
  19. diameter
    the length of a straight line through the center of a circle
  20. radius
    the length of a line between a circle's center and perimeter
  21. proof
    a formal series of statements showing that something is true
  22. formula
    a group of symbols that make a mathematical statement
  23. equidistant
    exactly as far from one point as from another
  24. similarity
    the quality of being alike
  25. parallel
    being everywhere equidistant and not intersecting
Created on Wed Dec 09 10:01:03 EST 2020 (updated Mon Dec 21 15:11:33 EST 2020)

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