MCQ practice · SSC Higher Mathematics Board questions · Chapter 3: Geometry
What is DO : OA?
Think it through first, then pick an option.
- a 1 : 2
- b 1 : 3
- c 2 : 1
- d 3 : 1
Answer and explanation
Correct answer: a 1 : 2
At the centroid O, AO : OD = 2 : 1, so DO : OA = 1 : 2.
Why the other options are wrong
- b 1 : 3: 1 : 3 is DO : AD; the question asks DO : OA, which is 1 : 2.
- c 2 : 1: 2 : 1 is AO : OD, the reverse of the asked ratio; DO : OA = 1 : 2.
- d 3 : 1: A median is divided in the ratio 2 : 1, not 3 : 1; DO : OA = 1 : 2.
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