Geometry
Hong Kong
Stage 1 - Stage 3
Proofs with Quadrilaterals
Interactive practice questions
$ABCD$ABCD is a parallelogram with $AE=FC$AE=FC. Prove that $DE$DE=$FB$FB.
In $\triangle AED$△AED and $\triangle CFB$△CFB we have :
Easy
5min
$ABCD$ABCD is a parallelogram, with $AY$AY=$XC$XC.
Prove that the two triangles $\triangle AYB$△AYB and $\triangle CXD$△CXD are congruent.
Easy
4min
In the diagram, $ABCD$ABCD is a square, and $AE=CF$AE=CF. Prove that $AF=EC$AF=EC.
Easy
5min
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