Similarity, BPT, areas of similar triangles, Pythagoras applications.
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Q1 · Triangles · HARD
In △ABC, DE is parallel to BC, with D on AB and E on AC. If AD = 4 cm, DB = 6 cm, and AE = 3 cm, then EC equals:
Q2 · Triangles · HARD
In triangle ABC, D is a point on BC such that BD = 3 cm and DC = 5 cm. If the area of triangle ABD is 18 cm², what is the area of triangle ABC?