Question #06bcd
1 Answer
Sep 13, 2015
its simple
Explanation:
Draw AE perpendicular to BC.
Since angle AED = 900,
Therefore, in triangle ADE
angle ADE < 900 and angle ADB > 900
Thus, triangle ABD is obtuse angled triangle and triangle ADC is acute angled triangle.
Triangle ABD is obtuse angled at D and AE is perpendicular to BD produced,
Therefore,
Triangle ACD is acute angled at D and AE is perpendicular to BD produced,
Therefore,
(since, CD = BD)
Adding (i) and (ii)