Даны треугольники \( A B C \) и \( A_{1} B_{1} C_{1} \), у которых \( \angle A=\angle A_{1},[A B] \equiv\left[A_{1} B_{1}\right],[B C] \equiv\left[B_{1} C_{1}\right], \mathrm{m}(\angle C)=80^{\circ} \), а угол \( C_{1} \) - тупой. Найдите \( \mathrm{m}\left(\angle C_{1}\right) \). 28

\( Q(7,10) \). Cari kecerunan bagi persamaan pembahagi dua sama serenjang untuk garis lurus \( P Q \). (TP4) A straight line passes through point \( (P(2,5) \) and point \( Q(7,10) \). Find the gradient of the equation of the perpendicular bisector for the straight line \( \overline{P Q} \) [3 markah / marks \( ] \)

4a If \( (0,1),(a, 3),(2,5) \) are collinear, find the value of a

Dado un cilindro con un radio de 4 cm, ¿cuál debe ser la altura para que el volumen sea \( 64\pi \) cm³?

24) ABC is a triangle in which \( \mathrm{m}(\angle \mathrm{A})=60^{\circ}, \mathrm{b}: \mathrm{c}=5: 8 \) and the area of the circumcircle of the triangle ABC is \( 147 \pi \mathrm{~cm}^{2} \), then the perimeter of \( \triangle \mathrm{ABC}=\ldots \ldots \ldots \cdots \cdot \mathrm{cm} \). \( \begin{array}{llll}\text { (a) } 21 & \text { (b) } 34 & \text { (c) } 54 & \text { (d) } 60\end{array} \)

Calculate the combined volume of a cone with a base radius of 4 cm and height of 9 cm, and a cube with side length of 6 cm.