Lesson- Isosceles Triangles E
 Isosceles triangles have Isosceles triangles havetwo sides equal. Isosceles triangles havetwo sides equal.triangle Isosceles triangles havetwo sides equal.two equal sides BWhich triangle looks like an isosceles triangle?CA∆ABC∆EFD∆XYZFDEZXY 5 In an isosceles triangle In an isosceles triangleisoscelestriangle In an isosceles trianglethe base angles In an isosceles trianglebase anglesthe base angles In an isosceles trianglethe base angles are equal. In an isosceles trianglethe base angles are equal. In an isosceles trianglethe base angles are equal. In an isosceles trianglethe base angles are equal.equal angles BCAWhich angles are base angles?∡A and ∡C∡B and ∡A∡B and ∡C Base angles are equalnot equal An easy way to determine which angles An easy way to determine which anglesare the base angles: An easy way to determine which angleshighlight where the equal sides meetare the base angles: An easy way to determine which angleshighlight where the equal sides meetare the base angles:isoscelestriangle An easy way to determine which angleshighlight where the equal sides meetare the base angles:equal sides An easy way to determine which angleshighlight where the equal sides meetare the base angles: An easy way to determine which angleshighlight where the equal sides meetare the base angles: An easy way to determine which angleshighlight where the equal sides meetare the base angles:equal sides meet here An easy way to determine which angleshighlight where the equal sides meetare the base angles:This is the 'roof' ofthe triangle An easy way to determine which angleshighlight where the equal sides meetroofare the base angles:This is the 'roof' ofthe triangle An easy way to determine which angleshighlight where the equal sides meetare the base angles:This is the 'roof' ofand the base angles the triangleare at the bottom An easy way to determine which angleshighlight where the equal sides meetare the base angles:anglesbaseThis is the 'roof' ofand the base angles the triangleare at the bottom Identify the 'roof'A∡CB∡XZYQNM∡∡RPL Roof?Base? An equilateral triangles has all the sides equal An equilateral triangles has all the sides equalEquilateral Triangle An equilateral triangles has all the sides equal An equilateral triangles has all the sides equal An equilateral triangles has all the sides equal 8 Since all the sides are equal Since all the sides are equalequal sides Since all the sides are equalthen the angles must be equal as well Since all the sides are equalthen the angles must be equal as well Since all the sides are equalthen the angles must be equal as well Since all the sides are equalthen the angles must be equal as well Since all the sides are equalthen the angles must be equal as wellEqual Angles That means each angle must be 60∘ in an Since all the sides are equalthen the angles must be equal as wellequilateral triangle ∘∘∘ Each angle in an equilateral triangle is∘
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