A guide to properties of 2D Shapes by PlanBee
How many sides are there on a Decagon? - Quora
What are shapes that have 4 sides? - Quora
Quadrilateral - Wikipedia
Angles in triangles and quadrilaterals - KS3 Maths - BBC Bitesize
What shape has 6 parallel sides where distances between the opposite sides are different? - Quora
What is a quadrilateral with one right angle?
What is the area of a quadrilateral with four sides, when four lengths are known, and one angle is 90 degrees? - Quora
What is the name of a shape that has four equal sides and angles, but no right angles? - Quora
What are Quadrilateral Shapes?
Shape: Quadrilateral – Elementary Math
Angles of Square - Interior Angles, Diagonal Angles, and Sum of Angles
What is a pentagon with equal sides called? - Quora
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What are the 7 different types of angles? - GeeksforGeeks