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In a school, the area of Hall 1 equals the area of Hall 2. The area of Store A equals the area of Store B. A small store of equal area is built next to each hall: Store A beside Hall 1 and Store B beside Hall 2.
By which axiom are the combined areas (Hall 1 + Store A) and (Hall 2 + Store B) equal?

Class 9Euclid's AxiomsGeometry — Foundations
  • AIf equals are added to equals, the wholes are equal
  • BThe whole is greater than the part
  • CThings which coincide are equal
  • DAll right angles are equal

Step-by-Step Solution

Hall1 = Hall2 and StoreA = StoreB. Adding equal store areas to equal hall areas keeps the wholes equal: Hall1+StoreA = Hall2+StoreB.
Answer: A) If equals are added to equals, the wholes are equal

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