Isosceles Triangles
ICSE · Class 9 · Mathematics
All formulas from Isosceles Triangles in ICSE Class 9 Mathematics. Key equations, constants, and identities for board exam preparation.
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Main Theorems
If two sides of a triangle are equal, the angles opposite to them are also equal.
If two angles of a triangle are equal, the sides opposite to them are also equal.
Solved-Pattern Results
angle BAD : angle ADB = 3 : 1
Ext. angle CEA = the sum of two interior opposite angles = 32° + 36° = 68°
a + 80° + 80° = 180°
angle OBC = angle OBA = angle OCB = angle OCA
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