Solved IB ACIO Question
A solved IB ACIO PYQ — decoded step-by-step.
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Q · Counting of Figuresmedium · 45s
How many triangles are there in a figure where a triangle is divided by two lines parallel to its base into 3 parts?
TopicCounting of Figures
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Two lines parallel to base divide the main triangle into 3 smaller triangles and 3 trapeziums.
Triangles formed are: 3 small triangles + 3 combined triangles + main triangle = 7 triangles total.
Final Answer: Option C — 7