Question

In an equilateral triangle ABC, if AD  BC, then AD2 = ?

Answer 1

Answer:

In ∆ADC,applying Pythagoras theorem we get,

AC²=AD²+DC²

BC²=AD²+DC²(AC=BC)

2DC²=AD²+DC²(BC=2)

4DC²=AD²+DC²

3D²=AD²