Question

answer with explation ? ​

Answer 1

Answer:

In the given ∆ABC,

AB is perpendicular to BC that means <B = 90°

AB = BC

Therefore,

<A = <C (angles opposite to equal sides are equal)

Now,

<A + <B + <C = 180° (Sum of <s in a ∆ is 180°)

<A + <B + <A = 180° (Since <A = <C)

2<A + <B = 180°

2<A + 90° = 180° (<B = 90°)

2<A = 180° - 90°

2<A = 90°

<A = 90°/2

<A = 45°