Verify experimentally that the opposite angles of equal sides of an
isosceles triangle are equal.
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Angles Opposite to Equal Sides of an Isosceles Triangle are Equal
Here we will prove that in an isosceles triangle, the angles opposite to the equal sides are equal.
Solution:
Angles Opposite to Equal Sides of an Isosceles Triangle are Equal
Given: In the isosceles ∆XYZ, XY = XZ.
To prove: ∠XYZ = ∠XZY.
Construction: Draw a line XM such that it bisects ∠YXZ and meets the side YZ at M.
Proof:
1. In ∆XYM and ∆XZM,
XY = XZ (Given)
XM = XM (Common side)
∠YXM = ∠ZXM (XM bisects ∠YXZ. )
∆XYM ≅ ∆XZM ( By SAS criterion )
∠XYZ = ∠XZY (CPCTC)
Hence Proved.
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