# Unit: Classifying 2-D shapes

## Lessons:

8 lessons

### Rotational Symmetry

In this lesson you will learn what rotational symmetry is and also the way to work out the order of rotational symmetry for a given shape.

### Lines of symmetry

In this lesson you will learn about lines of symmetry and the way to determine how many lines of symmetry a shape has.

### Classifying triangles

In this lesson you learn how to describe the properties of scalene, isosceles and equilateral triangles. You will also learn how to identify and classify triangles inscribed in circles.

### Angles in a triangle

In this lesson, you will understand that the interior angles in a triangle sum to 180°. Solve problems involving unknown angles in triangles.

### Comparing quadrilaterals

In this lesson, you will recap your knowledge on quadrilaterals and compare quadrilaterals by comparing symmetry, side length, parallel sides and angles.

### Diagonals in quadrilaterals

In this lesson, you will compare the properties of diagonals in quadrilaterals.

### Internal angles in a quadrilateral

In this lesson, you will be able to use triangles to deduce the sum of the interior angles in a quadrilateral. You will also be able to find unknown angles in quadrilaterals.

### Tessellating quadrilaterals

In this lesson, you will use the properties of triangles and quadrilaterals to create and describe tessellation patterns.