Polygon party. Only 2D shapes with straight sides are invited to the polygon party.. Quadrilaterals. Quadrilaterals have 4 sides and their internal angles add up to 360°. Square, rectangle ...

The shape has 5 sides and can be split into 3 triangles. The sum of the angles is \(3 \times 180 = 540^{\circ}\). To find the value of \(x\), add together the known angles and subtract the answer ...

Zach’s shape is a decagon, because it has 10 sides and 10 angles. The sides and angles are all different, so it is an irregular decagon. Zach asks what a regular decagon would look like, and Ada ...

This week, I want you to step back in time -- to the years in grade school or high school geometry classes. That's probably when you learned about polygons -- and perhaps the last time you thought ...