3. Sketch and name a quadrilateral that fits each description. Make sure to label all equal sides and angles. a) The diagonals are equal, but the sides are not all equal. b) The diagonals are equal and all the sides are equal. c) The diagonals are not equal and no two sides are equal.

WJEC June 2017 Q6 The coordinates of the points \( F \) and \( G \) are \( (8,20) \) and \( (-4,10) \) respectively. (a) Calculate the length of the line FG. Express your answer as a surd in its simplest form, \( n \sqrt{m} \).

Define la diferencia entre un arco mayor y un arco menor en un círculo.

7. En cada ítem, estudiar la posición relativa entre las dos rectas dadas y graficar ambas en un mismo sistema de coordenadas cartesianas. a) \( \left\{\begin{array}{l}x=1-5 \lambda \\ y=2+3 \lambda \\ z=-5+\lambda\end{array}\left\{\begin{array}{l}x=1 \\ y=1 \\ z=\mu\end{array}(\lambda, \mu \in \mathbb{R})\right.\right. \) b) \( \left\{\begin{array}{l}x=3+2 \alpha \\ y=1-\alpha \\ z=5\end{array}\left\{\begin{array}{l}x=-1-6 \beta \\ y=3+3 \beta \\ z=5\end{array} \quad(\alpha, \beta \in \mathbb{R})\right.\right. \)

১৯. সামান্তরিকের ক্ষেত্রফল নির্ণয়ের সূত্রটি লেখ।

Вариант 8. № 1. Построить линии, заданные следующими уравнениями: 1) \( x^{2}=1-y^{2} \); 2) \( x=5 ; \) 3) \( 4 y+y^{2}+2 x=0 \) 4) \( y^{2}+4-x^{2}=0 \)