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Summary Class 10 Trigonometry Complete Notes & Important Formulas

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These are comprehensive, clear, and well-structured notes for Class 10 Trigonometry. What is included in this document: - Complete trigonometric ratios and identities explained in simple terms. - Important formulas and values for quick revision. - Step-by-step solved examples and practice questions. - High-yield points to help you score top marks in your board exams. Perfect for students looking for quick revision before exams or clear concept building.

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कक्षा 10 ग णित: त्रिकोणि मि त (Trigonometry)
संपू र्ण अध्ययन सामग्री, सूत्र और हल स हत उदाहर (Complete Revision Notes)



1. त्रिकोणि मि त का प रिचय (Introduction to Trigonometry)

' त्रको म त' (Trigonometry) शब्द ग्रीक भाषा के तीन शब्दों से मलकर बना है: Tri (तीन), Gon (भुजा) और Metron (माप)।
ग त की इस शाखा में हम एक समको त्रभुज (Right-Angled Triangle) की भुजाओं और को ों के बीच के संबंधों का अध्ययन करते
हैं।


समिकोणि त्रिभुज की भुजाएँ (Right Triangle Sides):

• कणिर्ण (Hypotenuse): समको (90°) के सामने वाली सबसे लंबी भुजा।
• लंब (Perpendicular): वचाराधीन को (θ) के ठीक सामने वाली भुजा।
• आधारि (Base): वचाराधीन को (θ) से सटी हुई भुजा।




पाइथागोरिस प्रमिेय (Pythagoras Theorem):
कसी समको त्रभुज में: (क र्ण)2 = (लंब)2 + (आधार)2
समीकर रूप: H2 = P2 + B2



2. त्रिकोणि मितीय अनुपात (Trigonometric Ratios)

कसी समको त्रभुज के न्यूनको (θ) के सापेक्ष भुजाओं के अनुपातों को त्रको मतीय अनुपात कहते हैं:


अनुपात का नामि सं क्षप्त रूप सूत्रि (Hindi) सूत्रि (English)


Sine of θ sin θ लंब / क र्ण P/H

Cosine of θ cos θ आधार / क र्ण B/H

Tangent of θ tan θ लंब / आधार P/B

Cosecant of θ cosec θ क र्ण / लंब H/P

Secant of θ sec θ क र्ण / आधार H/B

Cotangent of θ cot θ आधार / लंब B/P



व्युत्क्रमि संबंध (Reciprocal Relations):

• sin θ = 1 / cosec θ | cosec θ = 1 / sin θ


1

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