In a right angled triangle ΔDEF, ∠E is a right angle. EF = 15 cm and DF = 17 cm. Find DE.
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Step-by-step explanation:
DF^2=DE^2+EF^2
DF^2-EF^2=DE^2
17^2-15^2= DE^2
289-225=DE^2
DE^2=289-225
DE^2=64
DE=8
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