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Please help me on 13.

Please help me on 13.-example-1

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The only one I see is 10, so I'll assume that's what you meant. This right angle is split into two halves, and right angles are 90°. Since one half f it is 49° the other half must be 41°. 41°-3 (because it's X+3) is 38, so X=3
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