Angle opposite to longer side

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Chapter 7 Class 9 Triangles

Serial order wise

Last updated at April 16, 2024 by Teachoo

Ex7.4, 4 AB and CD are respectively the smallest and longest sides of a quadrilateral ABCD (see the given figure). Show that ∠A > ∠C and ∠B > ∠D. Given: AB is the smallest side CD is the longest side To prove: ∠A > ∠C & ∠B > ∠D Proof: Join A & C, and mark the angles In ∆ABC, BC > AB ∴ ∠1 > ∠2 Adding equations ∠1 + ∠3 > ∠2 + ∠4 ∠A > ∠C Now, solving for ∠ B > ∠ D For ∠B > ∠D Join B & D, and mark the angles In ∆ABD, AD > AB ∴ ∠5 > ∠6 Adding equations ∠5 + ∠7 > ∠6 + ∠8 ⇒ ∠B > ∠D Hence proved