She tucked the pencil in the spiral part of her tablet.
Many of them were ones he had suggested – like the size of the fireplace and replacing the stairs with a spiral staircase.
He looked up to see the boy standing above him, holding out a small spiral notebook.
The steady downward spiral of snowflakes was mesmerizing, peaceful.
This remark applies to the finding of the area of a parabolic segment (mechanical solution) and of a spiral, the surface and volume of a sphere and of a segment thereof, and the volume of any segments of the solids of revolution of the second degree.