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2 the acute angles of a scalene triangle are

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2.) The acute angles of a scalene triangle are congruent. 3.) If the sum of two angles is obtuse, then both angles are obtuse. 4.) In isosceles ABC, at least two angles are congruent. 5.) If the diagonals of a quadrilateral bisect each other and the angles, then the quadrilateral is a square. 6.) If two angles are supplementary and congruent, then they are right angles. 7.) The diagonals of a trapezoid bisect each other. 8.) If a triangle is equilateral, then it is equiangular. 9.) If two lines are parallel to the same line, then they are parallel to each other. 10.) A rhombus is a kite. 11. ) The complement of an acute angle is obtuse. 12.) The diagonals of a trapezoid are congruent. 13.) The opposite angles of a rectangle are supplementary. 14.) If line a is perpendicular to line b , and line a has a slope of 3/2, then line b has a slope of 2/3. 15.) A parallelogram is a rhombus. 16.) Three sides of a trapezoid are congruent. PART 3 : Determine whether each of the following are TRUE or FALSE. 1. If two parallel lines are cut by a transversal, then alternate interior angles are congruent. 2. Lines have no endpoints. 3. Rays may be named using any two contained points (e.g. AB uuur is the same as BA uuur ). 4. An endpoint of LQ uur s is Q . 5. LW uuuur and LR uuur may be opposite rays. 6. In the diagram at right, DG uuur and CH uuur are opposite rays. 7. In the diagram at right, DH uuuur and CH uuur name the same ray. 8. In the diagram at right, DEF and GEF name the same angle. 9. In the diagram at right, GC DH CG = . 10. In the diagram at right, HC CG HC = uuur uuur . 11. In the diagram at right, EA EF AEH = ∠ uuur uuur . 12. If two angles of one triangle are congruent to two angles of a second triangle, then the remaining angles in each triangle are also congruent. 13. “CPCTC” stands for “Congruent Parts of Corresponding Triangles are Congruent.” 14. A right angle is equal to 89 o 59’ 60”. A B C D E F G H

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15. The inverse of: “If it is exam time, then we study.” is “If we study, then it is exam time.” PART 4 : Determine whether each of the following are ALWAYS, SOMETIMES, or NEVER true: 1. A median of a triangle is also an altitude of the triangle. 2. Two scalene triangles are congruent. 3. A right triangle is equilateral. 4. The area of a circle is 2 . r π 5. A square has perpendicular diagonals. 6. A rectangle has 4 congruent sides. 7. An isosceles triangle has diagonals that bisect each other. 8. Supplementary angles are both acute. 9. The union of two distinct rays with a common endpoint is an angle. 10. Two angles supplementary to the same angle are congruent to each other. 11. Triangles can be proved congruent by AAA. 12. If a statement is true, then its converse is also true. 13. Relative position can be assumed from a diagram. 14. The exterior angle of a triangle is equal to the sum of the interior angles.
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