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Transcript
The Isosceles Triangle
Theorems
Section 4-4
The Isosceles Triangle
Theorem
• If two sides of a
triangle are
34°
congruent, then
2.8 inches
the angles
2.8 inches
opposite those
sides are
73° 73°
congruent
1.6 inches
Converse To The Isosceles
Triangle Theorem
• If two angles of a
triangle are
34°
congruent, then
2.8 inches
the sides
2.8 inches
opposite those
angles are
73° 73°
congruent
1.6 inches
Corollaries
• An equilateral is also equiangular
• An equiangular is also equilateral
• An equilateral Triangle has 3 60
degree angles
Corollaries
• The bisector of the vertex angle of
an isosceles triangle is
perpendicular to the base at the
midpoint.