# Tag Archives: 2D Space

## Angles

The students in Five White have been learning about the different types of angles.

Acute Angle: an angle that is less than 90°

Right Angle: an angle that is exactly 90°

Obtuse Angle: an angle that is greater than 90° but less than 180°

Straight Angle: an angle that is exactly 180°

Reflex Angle: an angle that is greater than 180° and less than 360°

Revolution: a 360° angle, a full rotation, a complete turn so it points back the same way

The students in Five White took photos of angles they found in their classroom, take a look at the slideshow below.

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What angles can you see in the photos? Can you see more than one type of angle in each photo?

Filed under Mathematics

## 2D Space

The students in Five White are learning about two-dimensional space. So far we have learnt about the different types of triangles, quadrilaterals and irregular and regular polygons.

Triangles

• Right-angled triangles have one right angle of 90°.
• Isosceles triangles have two equal sides and two equal angles.
• Equilateral triangles have three equal sides and three equal angles.
• Scalene triangles have three sides that are all different lengths. Quadrilateral means ‘four sides’, therefore any four sided shape is a quadrilateral.

• A rectangle is a four sided shape where every angle is a right angle and opposite sides are parallel and of equal length.
• A rhombus is a four sided shape where all sides have equal length, opposite sides are parallel and opposite angles are equal.
• A square is a four sided shape that has four equal sides, every angle is 90° and all opposite sides are parallel.
• A parallelogram is a four sided shape with all sides parallel and equal in length and opposite angles are equal. A polygon is a plane shape (flat shape) with three or more straight sides. E.g. a triangle, hexagon and pentagon.

Regular polygons have equal sides and angles. Irregular polygons do not have sides that are all equal in length and/or at least one angle is different in size from the other angles. The students used the ‘Show Me’ app, cards and computers to practise drawing and explaining the different triangles, quadrilaterals, irregular and regular polygons. Take a look at the videos and the slideshow below.

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