Does a triangle have to add up to 180 degrees

- Does a triangle add up to 180 degrees
- Does a triangle always add up to 180 degrees
- Does every triangle add up to 180 degrees
- In a right triangle one angle measures x° where sin ° = x 4 5 . what is cos(90° − °) x
- Height of triangle
- How to find sides of triangle with angles
- How to find the sides of a triangle