Mathematics
In the adjoining figure, CD =
36 cm
40 cm
41 cm
None of these
Pythagoras Theorem
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Answer
From figure,
⇒ BE = AD = 20 cm and AB = DE = 40 cm
⇒ CE = BC - BE
⇒ CE = 29 - 20
⇒ CE = 9 cm
From figure,
△ CDE is right angled triangle.
By pythagoras theorem,
Hypotenuse2 = Base2 + Height2
⇒ CD2 = DE2 + CE2
⇒ CD2 = 402 + 92
⇒ CD2 = 1600 + 81
⇒ CD2 = 1681
⇒ CD =
⇒ CD = 41 cm.
Hence, option 3 is the correct option.
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