Please solve question no 6 with proper explanation 

Asked by adityaahuja099 | 20th Nov, 2017, 07:48: PM

Expert Answer:

begin mathsize 16px style From space the space given space diagram space
angle DEC equals 90 degree space space space space space space space space space space space space Angle space inscribed space in space straight a space semi minus circle
also space angle DCE equals 40 degree
In space increment DEC comma
angle DEC plus angle CDE plus angle DCE equals 180 degree
90 degree plus angle CDE plus 40 degree equals 180 degree
angle CDE equals 180 degree minus 130 degree
angle CDE equals 50 degree equals angle ODB
Given space that space
angle AOD equals 75 degree
angle AOD plus angle AOC equals 180 degree space space space space space space space space space space space space space Angles space are space in space semi minus circle
rightwards double arrow angle AOC equals 180 degree minus 75 degree
rightwards double arrow angle AOC equals 105 degree
rightwards double arrow angle AOC equals angle DOB space equals 105 degree space space space space space space Vertically space opposite
In space increment DOB comma
angle DOB plus angle ODB plus angle OBD equals 180 degree
105 degree plus 50 degree plus angle OBD equals 180 degree
angle OBD equals 25 degree
angle OBD equals angle OEB equals 25 degree


end style

Answered by Sneha shidid | 30th Nov, 2017, 09:57: AM