Question

Calculate: 

(iii) ∠BAC

Answer 1

Given: ACE = 130⁰; AD = BD = CD

Proof:

(iii)

∠BAC = ∠DAB + ∠DAC
substituting the valuefrom 9( i) and (ii)
∠BAC = 40⁰ + 50⁰
⇒ ∠BAC = 90⁰