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Geometry
Geometry Cheat Sheet
| Question | Answer |
|---|---|
| sin(x)= | opposite/hypotenuse |
| cos(x) | adjacent/hypotenuse |
| tan(x) | opposite/adjacent |
| alternate interior angles | <c=<f and <d=<e |
| alternate exterior angles | <a=,h and <b =,g |
| corresponding angles | <a=<e, ,b=<f, <c=<g and <d=<h |
| supplementary angles | <c+<e=180, <d+<f=180, <a+<b=180 <c+<d=180, <e+<F+180, <g+<h+180 |
| Reflection in the x-axis: | A(x,y) ->A'(x,-y) |
| Reflection in the y-axis: | A(x,y) ->A'(-x,y) |
| Reflection through the origin: | A(x,y) ->A'(-x,-y) |
| Transformation to the left m units and up n units: | A(x,y)->A'(x-m,,y+n |
| Rotation of 90° | A(x,y)->A'(-y,x) |
| Reflection over the line y | A(x,y) ->A'(x,y) |
| Rotation of 180 | A(x,y)->A'(-y,-x) |
| Rotation of 270 | A(x,y)->A'(y,-x) |
| Dilation of n | A(x,y)->A'(xn,yn) |
| Acute: | : All angles are < 90° . |
| Obtuse: | There is an angle > 90° |
| Right: | There is an angle = 90° . |
| Value of each Interior Angle: | 180(n-2)/n |
| Sum of Interior Angles: | 180(n-2) |
| Value of each Exterior Angle: | 360/n |
| Sum of Exterior Angles: | 360 |
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