Is D meant to represent the midpoint of side MN (i.e. where the median from O touches it)? If so, angle ODN is obtuse, so can't be 40 degrees.
Perhaps a typo?
construct a right angled triangle MNO ,having hypotenuse ON = 65 mm and the median from the angular point O, making the angle ODN with the hypotenuse = 40 degree.
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1 answer