Question

8) If two angles of a triangle are 55 degrees and 65 degrees then the 3rd
angle =
a) 120 degrees
b) 180 degrees
c) 60 degrees​


Explain your answer

Answer 1

Answer:

c) 60 degrees is your correct

as sum of angles of triangle are 180 ⁰

Answer 2

Answer:

c) 60° is the correct answer.

Step-by-step explanation:

Given,

\angle{1st}∠1st = 55°

\angle{2nd}∠2nd = 65°

To find,

Measure of the 3rd angle.

Knowledge Required,

The sum of all the angles of a triangle is 180°.

Finding the 3rd angle.

\angle{1st}∠1st +\angle{2nd}∠2nd +\angle{3rd}∠3rd = 180°

⇒55°+65°+\angle{3rd}∠3rd = 180°

⇒ 120° + \angle{3rd}∠3rd = 180°

⇒\angle{3rd}∠3rd = 180° - 120°

⇒\angle{3rd}∠3rd = 60°

.°. \angle{3rd}∠3rd = 60°

Hence, option c) 60° is the correct answer.