The answer is 100°
A parallelogram is any four sided shape with two pairs of opposite parallel and equal length sides. It is safe to say that a square is a parallelogram and not the other way round.
To explain how we got to 100 degrees, I have attached an image.
Based on the image attached, the opposite angles are equal. The adjacent angles are supplementary. With this in mind, the supplement of 80° will be 100°
 
        
                    
             
        
        
        
Answer:
Folksonomy.
Explanation:
A system of classifying and organizing online content into categories by the use of user-generated metadata such as keywords is called a folksonomy.
This ultimately implies that, folksonomy is a user-generated system which is typically used for classifying and organizing online content into various categories through the use of metadata such as keywords, electronic tags and public tags in order to make it easier to find in the future.
Hence, folksonomy is highly beneficial in areas such as collaborative learning, teacher resource repository, collaborative research, educational platforms, e-commerce etc. 
 
        
             
        
        
        
Answer:
Logical Data Model
Explanation:
An Entity Relationship Diagram (ERD) is a model or a diagram designed to reveal the relationship between various entities such as people, places, objects, and so on within an institution. Entity relationship diagram is also known as Entity relationship model. This model is used to design relational database by various sectors such as education, engineering, business, etc. 
<u>ERD is designed using conceptual data model, logical data model, and physical data model</u>. 
The visual practice or model that gives more insight into the logical relations among the entity is the logical data model. 
The logical data model is used to illustrate more detailed operational and relational data among the entities. It is more detailed than the conceptual data.
So, the correct answer is logical data model.
 
        
             
        
        
        
Answer:
it's a software
Explanation:
NetBeans IDE lets you quickly and easily develop Java desktop, mobile, and web applications, as well as HTML5 applications with HTML, JavaScript, and CSS. The IDE also provides a great set of tools for PHP and C/C++ developers.
 
        
             
        
        
        
Answer:
<h3><em>Network</em> - It is defined as a group of two or more computer systems linked together. </h3>
<h3><em>Network Operating System</em> - It is a specialized operating system for a network device such as router. </h3>
Hope it helps!