"This is a game of pure manual dexterity, and is rare practice for cultivating steadiness of hand and…
A rhomboid is a parallelogam whose opposite sides are equal, and whose angles are not right angles.
A right-angled triangle is any triangle having one right angle. The side opposite the right angle is…
"Suppose a number of vessels, of different shapes and sizes to have a communication between them, by…
"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci.…
Its calyx and corolla displayed; the five large parts are the sepals; the four smaller, of two shapes,…
Glandular epithelium with the cells set round a simple saccular gland, highly magnified. "Glandular…
Cross section of steel beam that can be used to find area of composite figures.
Illustration of a sphere generated by the revolution of a semicircle ACB about its diameter AB as an…
"Every section of a sphere made by a plane is a circle."
A sphere with arcs and poles. "The distance of all points in the circumference of a circle of a sphere…
A sphere with quadrants and poles. "A point on the surface of a sphere, which is at the distance of…
Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…
Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…
Illustration of two intersecting spheres. "The intersection of two spherical surfaces is the circumference…
Illustration of a sphere with a polyhedral angle whose vertex is at the center of the sphere and whose…
Illustration of equal spheres with equilateral and equiangular triangles.