在綠色板上的直角三角形的水準向量例證 插畫檔

A right angled triangle with the base, altitude, or perpendicular and hypotenuse over a grungy textured color gradient green board. The geometric figure is hand drawn in yellow creme, cream, off white colored chalks. The right angle sign is marked at the vertex. The lines of the sides are very neatly drawn. The drawing is to the left in the frame and copyspace to the right. No people. The blackboard has dark corners and sides while the middle or center is in grey or gray or grayish tone. No people.