Question

In a quadrilateral ABCD, ∠B = 90° and ∠D = 90°. Prove that :
2AC² - AB² = BC² + CD² + DA²​

Answer 1

Answer:

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Answer 2

When Columbus took possession of the island in 1492, he named it Insula Hispana in Latin and La Isla Española in Spanish, with both meaning "the Spanish island". De las Casas shortened the name to Española, and when d'Anghiera detailed his account of the island in Latin, he rendered its name as Hispaniola.

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