Question

in ∆abc ,if ab=4cm,<a=50° and <b=80° then the length of bc is:​

Answer 1

Answer:

Attachment is your answer.

Answer 2

Answer:

Given: In ∆ ABC, BC = AB and ∠ B = 80°.

In ∆ ABC,

As, AB=BC

⇒∠A=∠C

Let ∠A=∠C=x

Using angle sum property of a triangle,

∠A+∠B+∠C=180°⇒x+80°+ x=180°⇒2x=180°-80°⇒2x=100°

⇒x=100°2⇒x=50°⇒∠A=50°