Based on the provided image, describe the mathematical concepts illustrated in questions 3 and 4.

Based on the image provided, here is the description of the mathematical concepts illustrated in questions 3 and 4:

Question 3: This question illustrates the concept of measuring angles using a protractor and a ruler. The image shows a triangle and a line intersecting it. The goal is to determine the angle of intersection, and it shows the correct alignment of the protractor with the line.

Question 4: This question also illustrates the measurement of angles with the help of a protractor. However, here we have two triangles, and the image shows that the protractor is used to measure the angle in both triangles.