# Lines and Triangles: Notes

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```					Lines and Triangles: Notes

Parallel Lines: lines that never intersect

Perpendicular Lines: lines the intersect at 90 degree angles

Skew Lines: lines on two different planes that will never intersect

Acute Triangle: a triangle that is made up of all acute angles

Obtuse Triangle: a triangle that has at least one obtuse angle

Right Triangle: a triangle that has a right angle

Sum of the angles inside a triangle: 1800
700
Ex.
To find the value of x, you add 70 and 50, which
is 120. Then subtract that from 180, which is
500                                                     60 degrees. So angle x is 60 degrees
x

Scalene Triangle:            8             6 An angle that has no side lengths the same.

12

Isosceles Triangle: 11       11           An angle with two side lengths the same.

7
Equilateral Triangle:                                 An angle with all the same side lengths.
6            6       6

6

```
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