Question

1. which of these figures is not a quadrilateral? a b c d d c b a

Explanation:

Step1: Define quadrilateral

A quadrilateral is a closed 2D shape with 4 straight sides.

Step2: Analyze each figure

• Figure A: 4 straight sides, closed shape.
• Figure B: Has a curved side, not 4 straight sides.
• Figure C: 4 straight sides, closed shape.
• Figure D: 4 straight sides, closed shape.

Step3: Identify non-quadrilateral

Only Figure B fails to meet the quadrilateral definition.

Answer:

B. The figure with a curved corner/side