Question

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C
)起如右圖,四邊形ABCD中,E在
AB BC= DE AE =4,
BE =1,則CD = ?
(A) 2.5
(B) 2
(C) 3
(D) √√√10
X=4
C
D
E
4
B

Answer 1

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綾

連接BD
BD^2
= AD^2 + AB^2
= (DE^2 - AE^2) + 25
= BC^2 - 16 + 25
= BC^2 + x^2

x^2 = 9
=> x = 3