Question Video: Identifying the Number of Triangles in a Composite Figure Mathematics • 4th Grade

Video Transcript

𝐴𝐵𝐶𝐷 is a rectangle where line 𝐴𝐶 and 𝐵𝐷 are drawn. How many triangles can be found in the rectangle?

We know that 𝐴𝐵C𝐷 is a rectangle. 𝐴, 𝐵, 𝐶, 𝐷, let’s connect those points: line 𝐴𝐵, line 𝐵𝐶, 𝐶𝐷, and 𝐴𝐷 or 𝐷𝐴. And two diagonal lines are drawn, lines 𝐴𝐶 and 𝐵𝐷. We have to count the number of triangles that have been made. There we have one triangle, two, three triangles, four. If lines 𝐴𝐶 and 𝐵𝐷 are drawn in rectangle 𝐴𝐵𝐶𝐷, you can find four triangles inside the rectangle.