| A | B |
|---|
| net | 2D representation of a 3D figure |
| probability | favorable outcomes / sample space |
| Arc Length Formula | (central angle/360)πd |
| Area of a Sector | (central angle/360)(πrˆ2) |
| hypotenuse of 45-45-90 | multiply leg by √2 |
| long leg of 30-60-90 | multiply short leg by √3 |
| area of a triangle | bh/2 |
| octagon | 8 sided polygon |
| radius is _____ to a line tangent to a circle | perpendicular |
| radius perpendicular to a chord | bisects chord and its arc |
| mid-segment of a triangle | 1/2 the base |
| opposite angles of quadrilateral inscribed in a circle | supplementary |
| Similar triangles have ____ angles | congruent |
| ways to prove triangles are similar | AA~ and SAS ~ and SSS~ |
| similar polygons | same shape, different size |
| Similar triangles have ____ sides | proportional |
| angle of elevation | angle from horizontal looking upward |
| angle of depression | angle from horizontal looking downward |
| translate (x, y) with vector <a,b> | <x + a, y + b> |
| decagon | 10 sided polygon |
| 2 angles with sum = 180 | supplementary |
| Pythagorean Theorem | aˆ2 + bˆ2 = cˆ2 |
| perimeter | distance around a figure |
| does NOT prove similar triangles | SSA |
| geometric mean | square root of product |
| central angle of a circle | = arc measure |
| inscribed angle of a circle | 1/2 arc measure |
| interior angle of a circle | 1/2 SUM of the intercepted arcs |
| exterior angle of a circle | 1/2 DIFFERENCE of its intercepted arcs |
| sine ratio | opposite/hypotenuse |
| cosine ratio | adjacent/hypotenuse |
| tangent ratio | opposite/adjacent |
| Area of a regular polygon | 1/2 Pa |
| Area of a trapezoid | (b1 + b2)•h / 2 |
| reflection | a flip of a figure over a line of symmetry |
| rotation | a turn a figure at an angle |
| translation | a horizontal and/or vertical shift (slide) |
| dilation | an enlargement or reduction of a figure |
| altitude | from the vertex perpendicular to opposite side |
| median | from the vertex to midpoint of opposite side |
| radius | 1/2 diameter |
| equation of a circle | (x – h)ˆ2 + (y – k)ˆ2 = rˆ2 |
| scale factor of similar polygons | ratio of corresponding sides |
| triangle inscribed in a semicircle | right triangle |
| two tangents from same exterior point of a circle | congruent |
| point symmetry | rotation of a figure around its center |
| central angle of a regular polygon | 360 / number of sides |
