Answer:
x = 53
Step-by-step explanation:
Using the information that angles in a triangle add up to 180°, we can set up and equation to find the value of x
⇒ Use the information that angles in a triangle add up to 180°, form an equation
→ x - 11 + 48 + 90 = 180
⇒ Simplify
→ x + 127 = 180
⇒ Minus 127 from both sides to isolate x
→ x = 53
We can substitute the value of x back into x - 11 + 48 + 90 = 180 to see if our value of x is correct, if we end up on 180 on both sides then the value of x is correct
→ x - 11 + 48 + 90 = 180
⇒ Substitute in the value of x
→ 53 - 11 + 48 + 90 = 180
⇒ Simplify
→ 180 = 180
This means that x = 53 is correct
