Triangle with Lighthouse Small 320×240 Medium 640×480 Large 1024×768 Download Tiff Original 2400×1801 | (355.0 KB) Description An illustration of a three triangles created with boats and a lighthouse. This is an example illustration used to fine the height of an object situated about the plane of observation, and its height above the plane. Keywords boat, geometry, height, lighthouse, math, mathematics, object, Problem, triangle Galleries Miscellaneous Triangles Source: Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)
