el largo de una pintura rectangular es 8 pulgadas menor que el doble de su ancho. Si el marco tiene 4 pulgadas de ancho y un area de 816 pulgadas cuadradas. hallar las dimensiones de la pintura sin el marco

And explain how you got it so i can understand future problems : 3

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Can someone tell me if this is perpendicular? !