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Angles and Lines

Forgive us for being obtuse, but this is a cute concept, and we think it’s right for you. See more

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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