The first things that we tend to understand about objects that we see are colour and shape. In many instances, we understand the function of certain objects by seeing their shapes. Thus, it is important to understand the elementary shapes. Let’s study the topics below.

- Types of Angles
- Types of Triangles
- Types of Quadrilaterals
- Properties of Quadrilaterals
- Polygon and Polyhedrons

**FAQs on Understanding Elementary Shapes**

**Question 1: What are the elementary shapes?**

**Answer: **It refers to the development of tools to measure shapes and their sizes. Moreover, all the shapes are formed using curves or lines. We can organize them into line segments, triangles, angles, polygons, and circles. Most importantly, they have different measures and sizes.

**Question 2: What is RA tester?**

**Answer:** In mathematics, RA tester refers to a roughness tester that we use to quickly and accurately determine the surface texture or surface roughness of a material. In addition, it shows the measured roughness depth (Rz) as well as the mean roughness value (Ra) in micrometers or microns (µm).

**Question 3: How to measure an angle?**

**Answer:** For measuring angles, the best way is to use a protector. For doing this, start by lining up one ray along the 0-degree line on the protector. After that, line up the vertex with the midpoint of the protector. Next, follow the second ray to determine the angle’s measurement to the nearest degree.

**Question 4: What is the measure of one complete revolution?**

**Answer:**Extent of 1º (one-degree) is equivalent to a rotation 1/ 360 of a complete revolution. In addition, for measuring angles, it is convenient to mark degrees on the circumference of a circle. Therefore, a complete revolution is 360º, half of the revolution is 180º, a quarter of a revolution is 90º and so forth.