How do you draw a heptagon with three right angles?

To draw a heptagon with three right angles, first create a shape with seven sides, ensuring that three of the internal angles are 90 degrees. Start by drawing a right angle, then extend two lines to create the next two right angles, forming an "L" shape. From there, connect the endpoints with lines to complete the heptagon, adjusting the lengths of the remaining sides to ensure all angles add up to 900 degrees. The final shape will have the required three right angles among its seven sides.