A. Introduction

By observing the photo of Casa San Pablo, can you identify some geometric figures? Can you identify figures with the same shape but different in sizes?

The concept of similarity has a wide range of applications such as in engineering, architecture, surveying, visual arts like painting, photography, and many others.

In photography, when a photograph is taken, the image formed on the digital sensor is similar to the object being photographed. The illustration below will explain to us how similar triangles are being formed. This will also give us an idea on how we can apply the triangle similarity theorems in solving real-life mathematical problems that are related to this lesson.

Here, ΔACB ≅ ΔECD.

B. Development

I understand that ___________________.

I realize that ________________________.

I need to learn more about __________.