7.8 x 19.5 x 19.5 cm. (3.1 x 7.7 x 7.7 in.) ...

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.

Almost half of Brazil is covered in forest, producing nearly 150 million cubic meters a year. Thanks to the large country’s wide range of tree species, Brazilian designers looking for natural, locally ...

Whether you are sketching graphs in mathematics, understanding directions in geography, or reading blueprints in design class, horizontal and vertical lines are concepts you cannot avoid. They form ...