Answer:
B. 85
Step-by-step explanation:
A triangle has a total of 180 degrees.
85 + 55 = 140
140 + 40 = 180
Your answer is B. 85
The value of x is 85°
The sum of interior angles of a triangle are 180°
If ∠A, ∠B, ∠C are three interior angles of a triangle,
Then ∠A+∠B+∠C = 180°
Given that, Two angles of the triangle are 40° & 55°
Let, the third angle be x.
Then, Sum of angles = 180°
⇒ 40°+55°+x = 180°
⇒ x+95° = 180°
⇒ x = 180°-95°
⇒ x = 85°
The value of x = 85°
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