MCQ Practice Arena
Three Formulae, Maximum Marks — Distance, Section, Area at Speed
Coordinate Geometry is the most formula-mechanical chapter in Class X — three formulae cover the entire chapter. CBSE Boards deliver 8–10 marks annually from distance formula, section formula, and area of triangle. "Classify the quadrilateral" problems (rhombus, square, parallelogram) are 4-mark CBSE staples. Collinearity via zero area is a quick 1-marker every exam.
Recall these cold before attempting MCQs — they appear in >70% of questions.
Distance formula: expand (x₂−x₁)² and (y₂−y₁)² separately before adding — avoids sign errors. Section formula: label which point is (x₁,y₁) and which is (x₂,y₂) consistently. For "classify quadrilateral" problems: compute all 4 sides and both diagonals — the combination tells you the shape. Area formula: use the cyclic (shoelace) pattern — go clockwise or anticlockwise consistently.
Work through each rung in order — do not jump to Hard before mastering Easy.
Distance between two points, midpoint, identify collinear points
Section formula, centroid, area of triangle from coordinates
Classify quadrilateral (all 4 sides + diagonals), external division
CBSE — section formula + area combo; NTSE — coordinate geometry logic
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