Coordinate Geometry · Class 9 · CBSE Mathematics

The points A(1, 2), B(6, 2), C(6, 5), and D(1, 5) are vertices of a quadrilateral in order. Identify the quadrilateral and find its perimeter.

Practice question from Coordinate Geometry (Class 9 · CBSE Mathematics), with the correct answer and a step-by-step solution.

medium · Subjective · Q-0B59E8

The points A(1, 2), B(6, 2), C(6, 5), and D(1, 5) are vertices of a quadrilateral in order. Identify the quadrilateral and find its perimeter.

Answer: AB and CD are horizontal with length 5 units, while BC and DA are vertical with length 3 units. Therefore, ABCD is a rectangle, and its perimeter is 2(5 + 3) = 16 units.

Solution

A and B have the same ordinate, so AB=6−1=5AB=6-1=5 units. B and C have the same abscissa, so BC=5−2=3BC=5-2=3 units; similarly, the opposite sides have equal lengths. Thus the quadrilateral is a rectangle with perimeter 2(5+3)=162(5+3)=16 units.

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