Interior angle, internal angle, the angle formed inside a polygon between two adjacent sides, or the angle inside a geometric figure at a vertex where two lines meet. The phrase زاویہ داخلہ is a compound noun. زاویہ (zawiya) means angle, from the Arabic root "ز و ي" (zaw ya), meaning to bend, to turn, to corner. داخلہ (daakhila) is an adjective meaning interior, internal, or inner, from the Arabic root "د خ ل" (dal kha lam), meaning to enter, to go inside. Together, زاویہ داخلہ means "interior angle". The phrase is used in geometry, in mathematics, in architecture, in engineering, and in art. It refers to the angle on the inside of a polygon, as opposed to the exterior angle (زاویہ خارجہ, zawiya khaarija). In a triangle, the sum of the interior angles is 180 degrees. In a quadrilateral, the sum is 360 degrees. The phrase is formal and technical. It is used in textbooks, in classrooms, in exam papers, and in professional discussions.
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DESCRIPTION
The phrase زاویہ داخلہ is built from two Arabic components. زاویہ (zawiya) is the noun for angle. داخلہ (daakhila) is the feminine adjective meaning interior. The adjective follows the noun in Arabic order, but the phrase is treated as a compound in Urdu. The phrase is feminine because زاویہ is feminine? Actually, زاویہ is feminine. You would say "یہ زاویہ داخلہ ہے" meaning this is an interior angle, using the feminine pronoun یہ.
In geometry, the interior angle is a fundamental concept. For a polygon with n sides, the sum of the interior angles is (n