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Basic Mathematics

Angles and Lines

Types of Angles

         

How many acute angles does an obtuse triangle have?

In the above diagram, A,A, B,B, and CC lie on a straight line. If ACD=151,\color{#3D99F6}{ \angle ACD ={151}^\circ}, which of the following is true of BCD\color{#D61F06} { \angle BCD}?

Angles ABCABC and CBDCBD are adjacent with common vertex BB and common edge BC.\overline{BC}. If ABC=51\angle ABC={51}^\circ and CBD=40,\angle CBD={40}^\circ, which of the following is true of ABD?\angle ABD?

If A\angle A is an acute angle, B\angle B is a right angle and C\angle C is an obtuse angle, which of the following is true of A+B+C?\angle A+\angle B+\angle C ?

In the above diagram, AA, BB, and CC lie on a straight line. Which of the following is true of angle BAC\angle BAC?

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