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Geometry

Angles and Lines

Types of Angles

         

How many acute angles does an obtuse triangle have?

In the above diagram, \(A,\) \(B,\) and \(C\) lie on a straight line. If \(\color{Blue}{ \angle ACD ={151}^\circ},\) which of the following is true of \(\color{Red} { \angle BCD}\)?

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 \(\angle A+\angle B+\angle C ?\)

In the above diagram, \(A\), \(B\), and \(C\) lie on a straight line. Which of the following is true of angle \(\angle BAC\)?

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