Geometry
Angles and Lines
How many acute angles does an obtuse triangle have?
Angles \(ABC\) and \(CBD\) are adjacent with common vertex \(B\) and common edge \(\overline{BC}.\) If \(\angle ABC={51}^\circ\) and \(\angle CBD={40}^\circ,\) which of the following is true of \(\angle ABD?\)
If \(\angle A\) is an acute angle, \(\angle B\) is a right angle and \(\angle C\) is an obtuse angle, which of the following is true of \(\angle A+\angle B+\angle C ?\)
