Lets take a walk in geometry
In geometry has many different angle types
There is acute witch is less than 90 degrees. Then there is right and that angle is exactly 90 degrees. Then the obtuse is more than 90 degrees bur less than 180 degrees. And the straight angle is the easiest because it is exactly 180 degrees and it is a straight line.
Triangles the 3 sided figure
There is so many different types of triangles like acute triangles and right, obtuse, scalene, isosceles, and equilateral.
The quadrilaterals are four sided polygons. The sum of all angles are 360 degrees.
Finding Missing Angles
How to find a Missing Angle
Finding missing angles are easy. In a triangle all the angles added together are 180 degrees. In a quadrilateral the angles added together equal 360 degrees. So you take the angles you have and add those together and then you subtract from 180 if it is a triangle and 360 if it is a quadrilateral.
First you take your protractor and put the little point on the vertex and then line up the line on the protractor and then you decide if it is acute right or obtuse and straight. then if it is acute it has to be less than 90 degrees and if it is a right it has to 90 degrees. Then if you have a obtuse angle it has yo be more than 90 but less than 180 degrees. Then if there is a straight it is exactly 180 degrees