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Answer:
Perimeter =40cm
Step-by-step explanation:
Triangle PQR is a 45-45-90 triangle.
PQ=1/root 2x QS
= 1/root 2x 10 root 2 note ..put the symbol of root
= 10cm.
Perimeter of PQRS =4x side
=4x 10
=40cm.
You can also find PQ using Pythagoras theorem.
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