Question 1206203
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These angles sum up to right angle.


The angles that sum up to right angle are called complementary.


So, the given angles 2 and 3 are complementary angles.


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To learn about complementary, supplementary and vertical angles,  read the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Angles/Angles-basics.lesson>Angles basics</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Angles/Vertical-Angles-.lesson>Vertical angles</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/geometry/How-to-solve-problems-on-suppl-compl-or-vertical-angles-Examples.lesson>HOW TO solve problems on supplementary, complementary or vertical angles - Examples</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Points-lines-and-rays/Solved-problems-on-supplementary-and-complementary-angles-and-pairs-of-angles.lesson>Solved problems on supplementary and complementary angles</A>
in this site.


You will find there everything you need to know in clear and compact form.


Consider these lessons as your handbook, &nbsp;textbook, &nbsp;guide, &nbsp;tutorials and &nbsp;(free of charge) &nbsp;home teacher.