В \( \triangle \mathrm{ABC} \angle \mathrm{C}=90^{\circ} \). Точка Д ве лежит в плоскости ABC , причем ДС \( \perp \mathrm{AC} \). Дожажите, что прямая AC перпевдикудярна к плоскости ДСВ. Постройте сечение тетразра гиоскостьо, проходящей через точки \( \mathrm{K}, \mathrm{M} \) и P .

cylindrical tank of diameter 28 m and height 2 m contains water to the dept Calculate: i) The capacity of the tank in litres. ii) The volume of water required to fill the tank in litres. Water was pumped into the tank starting at \( 11.25 \mathrm{a} . \mathrm{m} \). to 1.15 pm . when calculate the rate at which water was pumped into the tank. i) A rectangular tank has a base measuring has a base measuring 2.4 m bj the capacity of the tank is 6480 litres, find the height of the tank in metre ii) The above tank was initially \( 1 / 4 \) full of water

Analitik düzlemde \( d_{1}: 2 x+y-12=0 \) ve \( d_{2}: x-y+6=0 \) doğruları veriliyor. 9. \( d_{1} \) ve \( d_{2} \) doğruları ile \( x \) ekseni arasında kalan alanın kaç birimkare olduğunu bulu- nuz. 10. \( d_{1} \) ve \( d_{2} \) doğruları ile eksenler arasında kalan alanın kaç birimkare olduğunu bulunuz.

The points \( \mathrm{A}(-2,7), \mathrm{B}(-3,4) \) and \( \mathrm{C}(1,16) \) are collinear.

إذا كان هرم بقيمة ارتفاع 10 سم وقاعدة مربعة طول ضلعها 4 سم، بينما يكون هناك منشور له نفس القاعدة وارتفاعه 15 سم. احسب الفرق في الحجم بين الهرم والمنشور.

Identify the measure of each interior angle of a regular 15 - gon.