This document appears to be a worksheet or exercise on the properties of similar triangles. It provides several triangles and asks the student to determine if they are similar triangles or not, and explain the reasoning for each answer. The student is expected to fill in their responses for each numbered item in the document.

1. แบบฝึกหัด เรื่อง สมบัติของรูปสามเหลี่ยมคล้าย
ชื่อ _______________________ ชั้น ________ เลขที่ ______
จงพิจารณารูปสามเหลี่ยมที่กาหนดให้ เป็นรูปสามเหลี่ยมคล้ายกันหรือไม่ เพราะเหตุใด (ข้อละ 2 คะแนน)
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2. 2.
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3. 3.
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4. 5.
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