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### 17 Cards in this Set

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 TRANSVERSAL A LINE THAT INTERSECTS TWO PARALLEL LINES TO FORM 8 ANGLES SCALENE A TRIANGLE WITH NO CONGRUENT SIDES SIMILAR TRIANGLES TRIANGLES THAT HAVE THE SAME SHAPE, BUT MAY NOT HAVE THE SAME SIZE ROTATIONAL SYMMETRY A FIGURE HAS ROTATIONAL SYMMETRY IF IT CAN BE TURNED LESS THAN 360 DEGREES AND IT CAN STILL LOOK LIKE THE ORIGINAL PARALLEL LINES LINES IN THE SAME PLANE THAT DO NOT INTERSECT OBTUSE TRIANGLE AN OBTUSE ANGLE IS ANY ANGLE THAT IS MORE THAN 90 DEGREES BUT LESS THAN 180 DEGREES LINE OF SYMMETY A LINE THAT DIVIDES A FIGURE INTO TWO HALFS THAT ARE REFLECTIONS OF EACH OTHER ISOSCELES A TRIAGLE THAT HAS TWO CONGRUENT SIDES CONGRUENT TRIANGLES TRIANGLES THAT HAVE THE SAME SIZE AND SHAPE (EXACT REPLICAS) EQUALATERAL TRIANGLES ALL SIDES OF THE FIGURE ARE CONGRUENT COMPLIMENTARY ANGLES TWO ANGLES ARE COMPLIMENTARY IF THE SUM OF THEIR ANGLES ARE 90 DEGREES RIGHT ANGLE AN ANGLE THAT MEASURES 90 DEGREES, EXACTLY ACUTE ANGLE AN ANGLE WITH A MEASUREMENT OF GREATER THAN 0 BUT LESS THAN 90 DEGREES ALTERNATE EXTERIOR ANGLES Angles located outside a set of parallel lines and on opposite sides of the transversal intersecting lines ALTERNATE INTERIOR ANGLES Angles located inside a set of parallel lines and on opposite sides of the transversal INTERSECTING LINES OUTLIER A data point (or points) that lie far outside most of the rest of the points in the data set. right triangle A triangle containing an angle of 90 degrees