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Home » \( 2x + 30 - 3x = 100 \) - Appfinity Technologies

\( 2x + 30 - 3x = 100 \) - Appfinity Technologies

📅 March 1, 2026 👤 scraface

Mar 01, 2026

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📌 An equilateral triangle has a side length of \( s \) and its area is reduced by removing a smaller equilateral triangle from one corner, such that the side of the smaller triangle is \( \frac{s}{2} \). Determine the percentage decrease in the area of the triangle.

📌 The area of the original equilateral triangle is \( A_1 = \frac{\sqrt{3}}{4} s^2 \). The area of the smaller equilateral triangle with side \( \frac{s}{2} \) is \( A_2 = \frac{\sqrt{3}}{4} \left(\frac{s}{2}\right)^2 = \frac{\sqrt{3}}{4} \cdot \frac{s^2}{4} = \frac{\sqrt{3}}{16} s^2 \). The decrease in area is \( \Delta A = A_1 - A_2 = \frac{\sqrt{3}}{4} s^2 - \frac{\sqrt{3}}{16} s^2 = \left(\frac{4}{16} - \frac{1}{16}\right)\sqrt{3} s^2 = \frac{3\sqrt{3}}{16} s^2 \). The percentage decrease is:

📌 \frac{\Delta A}{A_1} \times 100 = \frac{\frac{3\sqrt{3}}{16} s^2}{\frac{\sqrt{3}}{4} s^2} \times 100 = \frac{3}{4} \times 100 = 75\%

📌 Thus, the percentage decrease in area is \(\boxed{75\%}\).

📌 This suite of questions and solutions integrates geometry with conceptual reasoning, appropriate for a math olympiad or advanced high school competition, while maintaining a clear and educational narrative.

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