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You have to change the denominator the the least common multiple then multiply the numerator by the number you multiplied it’s denominator with.
If you separate the triangles, you'll notice that both are literally the same triangle because all angles are the same.
The area of triangle ABC with the given parts is c- 7.3in
168,356. the ten thousand is the 6. To find the estimate, the one would stay there and the six would become a seven because the eight eight before the six is above five. All in all, the answer is 170.000