Can you help me figure out the different symbols and how many of them are there and put them in grouping

Please find the centroid and Ixx for the following shapes. Show all work with neat handwriting and step by step solutions.

Which side of a particular scale should I use if I want to draw these lines on a paper . For example I have 1) architect scale with the following dimensions : 1; 1 1/2; 16 ; 3/32; 3/4;1/8.  2. Engineering scale : 10; 20; 30; 60; 40;50 3.  metric scale : 1:100; 1:20; 1:50; 1:75;1:25;1:125

Q1. Why are standards so important for members of the engineering design team? Q2. What is "Engineering Design"? Q3.What are the four standard types of projections? Q4. What is the correct technique for free hand sketching a circle or arc? (list three methods steps) Q5. If we are in the construction industry, Why we really need to know how to read drawing? Q6. Understanding what the different lines on a drawing represent is really one of the key factors in being able to interpret the information that these drawings of trying to convey. Please explain the meaning of Visible lines, Hidden lines, Center line, Dimension and extension lines. Q7. What exactly is Graphical communication quiz and online exam testing you? Q8. What exactly is a Graphical Communication project/assignment supposed to help you? Q9. What is the difference between proportion and scale? Q10. What tools are useful for drawing straight lines? What tools are used for drawing arcs and circles? Q11. What are three…