Что такое наклон прямой и как его можно определить?

1) Prove that, \( b^{2}=a^{2}+c^{2}-2 a c \cos B \)

৫. निচের কোন বিন্দুট্টি \( x \) অক্ষের উপর অবস্থিত? \( \begin{array}{lr}\text { ক }(0,1) & \text { খ }(1,1) \\ \text { গ }(0,-1) & \text { ( }(1,0)\end{array} \)

The coordinates of puints \( O, A, B \) and \( C \) are \( (0,0),(2,1),(4,4) \) and \( (-1,7) \) respectively. The coordinates of point \( D \) is \( (x, y) \). Point \( M \) is the midpoint of line \( C D \) and it satisfies the vector equation \( O M=O A+\frac{5}{2} A B \). Determine the coordinates of point \( D \).

A pizza has a diameter of 12 inches. How much area does the pizza cover? (Use \(\pi \approx 3.14\))

61. Determine a área de um triângulo cujos lados têm \( 4 \mathrm{~cm}, 6 \mathrm{~cm} \) e 8 cm de comprimento.