Shapes Around Us

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A 3D shape is a shape that has length, width, and height. It takes up space and has volume. Examples: cube, cylinder, sphere, cone, pyramid.

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A prism has two parallel faces of the same shape connected by rectangular faces. A pyramid has one base and all other faces are triangles that meet at one point (apex).

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A cube has 6 faces, 12 edges, and 8 corners (vertices). All faces are squares of equal size.

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Euler's formula states that F + V - E = 2, where F = number of faces, V = number of vertices (corners), and E = number of edges.

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A net is a 2D pattern that can be folded to make a 3D shape. When you unfold a box and flatten it, you get its net.

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An angle is formed when two lines meet at a point. We see angles everywhere - in corners of books, doors, windows, and even in yoga postures.

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A right angle is exactly 90 degrees. You can make a right angle checker by folding a piece of paper in half twice. Right angles are found in corners of books, windows, and doors.

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An acute angle is smaller than a right angle (less than 90°). An obtuse angle is larger than a right angle (more than 90°).