Question

find the third angle if angle b is 110 degree and angle c is 40 degree​

Answer 1

Answer:

30 degree

Step-by-step explanation

b = 110 degree

c= 40 degree

therefore a =180 - (110+ 40 ) degree

therefore a = 30 degree

Answer 2

Answer:

30°

Step-by-step explanation:

Let ∠a be the third angle.

Given,

• ∠b = 110°
• ∠c = 40°

To find,

• ∠a

Knowledge Required,

• The sum of all 3 angles of a ∆ is 180°.

Finding ∠a :

∠a + ∠b + ∠c = 180°

⇒∠a + 110° + 40° = 180°

⇒∠a + 150° = 180°

⇒∠a = 180° - 150° [Transposition]

⇒∠a = 30°

.°. ∠a = 30°

Hence, the measure of third angle is 30°.