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No, the area of a triangle is half the base multiplied by the perpendicular height.

If the triangle has no perpendicular height, you can't use the length of a slanted side, watch out for that. Perpendicular lines meet like a capital T. At right angles.

Instead, you could use 1/2absinC

label each side of the triangle a,b and c.

label each corner with the same three letters but capitals.

label A the corner across from a

label B the corner across from b and so on.

find the sin of C using your calculator

multiply one half by the measures of a,b and sinC

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Q: The area of a triangle is the base multiplied by one half?
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