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newfoundland
The answer would be 58 squared cm because the area of a triangle is 1/2(base*height). The base is 42 cm and the height is 28 cm. 
percypercy168otvzio
588 square centimeters because the area of a triangle is 1/2* width * height. so you would have two 1/2 * 21 * 28 and adding the two products equals 588