Question

In tingle abc ,BC =ab and angle b = 80 then , angle a ÷ ?

Answer 1

Answer:

50°

Step-by-step explanation:

angleB+ angleA+ angleC= 180°. .... angle sum property of triangles

angleB = 80°. .... given

angleA= angleC..... equal angles of isosceles triangle

therefore, 80°+ 2( angle A) = 180°

angleA= (180-80)/2

= 50°

Answer 2

Step-by-step explanation:

a+b+c=180

x+x=100

2x=100/2

x=100/2

x=50=a