Johnny is a carpenter who builds wall shelves. The shelves are supported by pieces of wood in the shape of right triangles. The shelf support has a hypotenuse (C) of 19 inches and the side that touches the wall (B) measures 10 inches. Find the third side (A) of the right triangle.

What is the equation of a vertical line passing through the point (−5, −1)? y = −5 y = −1 x = −5 x = −1

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.