(1.) ข้อใดเป็นระยะระหว่างจุด \( (-1,1) \) และ \( (4,13) \) \( \begin{array}{ll}\text { ก. } 10 \text { หน่วย } & \text { ข. } 11 \text { หน่วย } \\ \text { ค. } 12 \text { หน่วย } & \text { ง. } 13 \text { หน่วย }\end{array} \)

[b] If \( b \) is the middle proportional between \( a \) and \( c \) , then prove that : \( \frac{a-b}{a-c}=\frac{b}{b+c} \)

A square prism measuring 2 m by 2 m in base length and 5 m in height has a half-sphere attached to the top. What is the total surface area of this composite solid?

Cos'è un cerchio?

In the opposite figure : \( \frac{\mathrm{BE}}{\mathrm{BC}}= \) \( \begin{array}{ll}\text { (a) } \frac{1}{2} & \text { (b) } 2 \\ \text { (c) } \frac{1}{3} & \text { (d) } 3\end{array} \)

the area of \( \triangle A B C=12 \mathrm{~cm}^{2} \), then \( \left(b^{2}+c^{2}-a^{2}\right) \tan A=\cdots \) 12 (b) 24