equilateral

"The rain fell five centimeters last night. "

"The marine biologist observed a foraminifer, a tiny aquatic creature with a hard, porous shell, under the microscope. "

"The brain's surface is covered in convolutions, allowing for a large surface area packed into a small space inside the skull. "

"My daughter's teacher is very kind and helpful. "

"The student's performance on the math test corresponded to the level of effort she put in during the week. "

"The dough was a divisible, easily separated into smaller portions for each cookie. "

"Scientists study foraminifers found in ocean sediments to learn about past climates because their shells reveal changes in water temperature. "

"The construction paper shape was a triangle. "

"To explain a chapter of the Bible."

"The teacher showed us a colorful polyhedron with triangles and squares for faces. "

"He divided the coins exactly in half."

"The ship's longitudinal was reinforced to withstand the strong waves. "