In the Giraud Palace and the great Palazzo della Cancelleria, pilasters appear in the external composition,…

"Section of Fortified Wall. (Interior on the left; exterior on the right.) a, a, is the abatis; b, b,…

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles…

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…

Clapboard or bevel siding is the horizontal and overlapping style of laying board on the exterior of…

Illustration to show that the bisector of an exterior angle of an isosceles triangle, formed by producing…