ClipArt ETC
Illustration of circle with parts drawn to show area.

Area of a Circle by parts

Illustration of circle with parts drawn to show area.

"Horseshoes. A, shoe for fore foot; ... a, toe-calks; b, heel-calks." -Whitney, 1911

Horseshoe

"Horseshoes. A, shoe for fore foot; ... a, toe-calks; b, heel-calks." -Whitney, 1911

"Horseshoes. ... B, shoe for hind foot; a, toe-calks; b, heel-calks." -Whitney, 1911

Horseshoe

"Horseshoes. ... B, shoe for hind foot; a, toe-calks; b, heel-calks." -Whitney, 1911

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion indicated; c, gills; d, mouth; e, tentacles or palps; f, posterior adductor muscle; g, anterior adductor; h, head-ganglion; i, ventricle of heart; j, auricle of heart; k, rectum; l, kidney; m, exhalent aperture; n, inhalent aperture." -Vaughan, 1906

Mussel Anatomy

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion…