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Points to Remember: Triangles | Mathematics (Maths) Class 10 PDF Download

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T r i a n g l e s
Page 2


T r i a n g l e s
Triangle is a closed figure formed by 3 lines
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T r i a n g l e s
Triangle is a closed figure formed by 3 lines
Key Points
If in two triangles, corresponding angles are equal, 
then their corresponding sides are in the same 
ratio and hence the two triangles are similar.
AAA similarity
criterion
AA Similarity
 Criterion
If in two triangles, two angles of one triangle are 
respectively equal to the two angles of the 
other triangle, then the two triangles are similar
SSS Similarity 
Criterion
If in two triangles, corresponding sides are in the 
same ratio, then their corresponding angles are 
equal and hence the triangles are similar
SAS Similarity 
Criterion
If one angle of a triangle is equal to one angle of another triangle and 
the sides including these angles are in the same ratio (proportional), 
then the triangles are similar
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