Answer:
if one of the angles is 90°
Step-by-step explanation:
when it has an angle that is 90° that means that it is a right triangle
let me know if you need more b/c I wasn't sure whether to make it more advanced for middle school lol
Hope this helps! :)
X + 2x -20 = 85
Combine like terms:
3x -20 = 85
Add 20 to both sides:
3x = 105
Divide both sides by 3
X = 35