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You can't tell from the information you have. There are an infinite number of triangles,

with different areas, that all have the same sum of (base + height).

The area of the triangle is (1/2) times (base) times (height).

You need the product of (base) times (height). If you only know their sum, you have no way

to find their product.

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Q: If you know the sum of the base and height of a triangle what is the area?
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