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Question

In triangle ABC,¯¯¯¯¯¯¯¯AB=12,¯¯¯¯¯¯¯¯AC=7, and ¯¯¯¯¯¯¯¯BC=10. If sides AB and AC are doubled while BC remains the same, then

A
The area is doubled
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B
The altitude is doubled
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C
The area is four times the original area
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D
The median is unchanged
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E
The area of the triangle is 0
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Solution

The correct option is D The area of the triangle is 0
In the new triangle ¯¯¯¯¯¯¯¯AB=¯¯¯¯¯¯¯¯AC+¯¯¯¯¯¯¯¯BC, that is, C lies on the line AB. Consequently, the altitude from C is zero. Therefore, the area of the triangle is zero.

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