| A | B |
|---|
| two figures are congruent when . . . | corresponding lines equal and corresponding angles equal |
| two figures are similar when . . . | they have exactly same shape but NOT same size. Corresponding angles are equal, corresponding lines are in same proportion |
| degrees around a point (circle) | 360 degrees |
| degrees on each side of a line | 180 degrees |
| degrees in a right angle | 90 degrees |
| acute angle | an angle between 0 degrees and 90 degrees |
| obtuse angle | an angle between 90 degrees and 180 degrees |
| complementary | two angles that sum to 90 degrees |
| supplementary | two angles that sum to 180 degrees |
| sum of 3 angles in a triangle | 180 degrees |
| largest angle in a triangle is . . . | opposite the longest side |
| smallest angle in a triangle is . . . | opposite the smallest side |
| the sum of the lengths of any 2 sides of a triangle is . . . | greater than the 3rd side |
| Area of a triangle = | 1/2 (base x height) |
| isosceles triangle | has 2 equal sides; angles opposite the equal sides are equal |
| scalene triangle | none of the sides are equal |
| equilateral triangle | all three sides equal; each angle = 60 degrees |
| right angle | triangle with a right angle (90 degrees) |
| hypotenuse | opposite side of right angle in a right triangle |
| Pythagorean Theorem | given sides a, b, and c of a right triangle: a2 + b2 = c2 |
