Question

Acellus

D
13
5
A
B
С
CD = [?]
Enter the number that belongs in
the green box.
Enter
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Answer 1

`CD = 13`

Explanation:

Given

The attached triangle

Required

Find
`CD`

From the question, we have:

`\angle CDB = \angle ADB`

`\angle ABD = \angle CBD`

Base on AAS theorem;

`CD = AD`

Hence:

`CD = 13`