5.3. A diameter and a chord, which is equal to the radius, are passed from the given point of the circle. Find the angle between them.

L115) L'area di un rettangolo è \( 1350 \mathrm{~cm}^{2} \). Calcola la misura delle sue dimensioni sapendo che la base è \( \frac{2}{3} \) dell'altezza. \( \quad[45 \mathrm{~cm} ; 30 \mathrm{~cm}] \)

\( A B \) - перпендикуляр к плоскости \( \alpha \cdot A M \) и \( A F \) - наклонные к \( \alpha \cdot \angle A M B=45^{\circ}, A M=8 \sqrt{2}, B F=6 \). Найдите \( A F \).

(3) จินดาขายที่ดินแปลงหนึ่งที่มีลักษณะเป็นรูปสี่เหลี่ยมรูปว่าว มีเส้นทแยงมุมยาว 50 วา และ 75 วา โดยขายในราคาตารางวาละ 4,000 บาท จินดาขายที่ดินแปลงนี้ได้เงินเท่าใด

NELLA REALTA Il bagno Per pavimentare un bagno rettangolare sono necessarie 63 piastrelle quadrate il cui lato mi- sura 25 cm . Calcola la lunghezza del bagno, sa- pendo che è largo \( 1,75 \mathrm{~m} \). [ \( 2,25 \mathrm{~m}] \)

9. ABC is a triangle in which \( m \overline{\mathrm{BC}}=m \overline{\mathrm{CA}}=2 \mathrm{~m} \overline{\mathrm{AB}} \). Internal bisector of \( \angle A \) meets \( \overline{\mathrm{BC}} \) at D and \( \overline{\mathrm{DE}} \) is drawn parallel to \( \overline{\mathrm{CA}} \) meeting \( \overline{\mathrm{AB}} \) at E . Find \( m \overline{\mathrm{DE}}: \mathrm{m} \overline{\mathrm{AB}} \).