Question

In ∆, = and ∠ = 40°. Find ∠​

Answer 1

Explanation:

a+b=110° ...(I)

c+a=135° ...(II)

we know that

a+b+c = 180°

110°+c=180° (putting ....(I) )

c=180°-110°

c=70°

c+a=135°

70°+a=135°

a=135°-70°

a=65°

a+b=110°

65°+b=110°

b=110°-65°

b=45°

So, the value of angle a, b, and c is 65°, 45°, 70° respectively