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Area of a triangles - same base and same parallels

https://ncert.nic.in/pdf/publication/sciencelaboratorymanuals/classIXtoX/mathematics/lelm402.pdf

https://www.cbsesamplepapers.info/cbse/cbse-class-9-maths-lab-manual-areas-of-two-triangles-on-the-same-base

https://www.sarthaks.com/248694/prove-that-triangles-on-the-same-base-and-between-the-same-parallels-are-equal-in-area