Question

if LABC is an equilateral traingle then .Find the value of a ​

Answer 1

if triangle abc is an equilateral triangle then the angles of this triangle will be 60 degree.
so in triangle ABD
angle ABD + angle ADB + angle BAD = 180 ( angle sum property)
60+ 90 + a = 180
150 + a = 180
a = 180 -150
a = 30 degree

Answer 2

In equilateral triangle all the side are equal and 180 degree
then Angle ABD + angle DBA+ angle BAD = 180
then 60 +90 +a=180
150+a = 180 then angle A=180-150=30degree


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