VTMO 2026 - Grade 9 - Semifinal - SET 06 - Self-study Question 3

Question 3

Which listed triple can be the three altitudes $h_a,h_b,h_c$ of a triangle?

$(1;2;3)$
$(1;0.5;0.8)$
$(2;4;4)$
$(3;6;8)$
$(3;6;9)$