hexagonal

"The perpendicular to the wall supported the shelf. "

"Clouds were forming interesting shapes in the sky. "

"The students are engineering a new system for managing their study group projects. "

"The stop sign has a regular hexagon shape. "

"I have a house and a car."

"My family has a different ideal for my future than I do. "

"The birds had built an amazing structure out of sticks and various discarded items."

"The carpenter carefully cut a section from the large log to use for the firewood. "

"The boss treated Sarah like an unequal, giving her only the worst tasks. "

"The scientist studied the crystal structure of the salt. "

"Put a cross for a wrong answer and a tick for a right one."

"It is generally known that the Earth is round."