Find the equation of \( 4 x^{2}+4 y^{2}=9 \) in cylindrical coordinates.

Arc Length Find the arc length for the following. 13. A circle has a radius of 5.75 inches. Find the length of the arc intercepted by a central angle of \( \frac{5 \pi}{6} \). 14. A circle has a diameter of 10 inches. Find the length of the arc intercepted by a central angle of \( 125^{\circ} \).

Bài 3. Cho \( D A B C \) có \( A B<A C \). Trên tia \( B A \) lấy điểm \( D \) sao cho \( B D=B C \). Nối \( C \) với \( D \). Tia phân giác góc \( B \) căt cạnh \( A C, D C \) lần lượt tại \( E \) và \( I \).

यदि त्रिभुज ABC समबाहु त्रिभुज भएको अवस्थामा \( \Varangle \mathrm{ABC} \) र शीर्षबिन्दु A तथा बिन्दु D लाई \( \mathrm{AC}=\mathrm{CD} \) हुद शत जोड्दा बन्ने \( \triangle \mathrm{ACD} \) मा बनेको कोण \( \Varangle \mathrm{CAD} \) बिचको अनुपात गणना गरी उल्लेख्य गर्नुहोस् । If triangle \( A B C \) is an equilateral triangle then calculate and mention the ratio between \( \angle A B C \) and \( \angle C A D \) formed in \( \Varangle A C D \) which is formed by joining vertex \( A \) and point \( D \) in such a way that: \( A C=C D \).

در یک مثلث 45°-45°-90°, اگر طول یکی از اضلاع برابر با 8 واحد باشد، طول وتر را محاسبه کنید.

QUESTION \( 16 \cdot 1 \) POINT Find the equation of the line passing through the points \( (-2,5) \) and \( (-7,5) \).