Starter quiz
- If two lines are perpendicular to each other then they create a ______ angle.
- '90 ' ✓
- Match the type of triangle to the interior angles.
- Scalene triangle⇔74°, 36° and 70° ✓
- Isosceles triangle⇔28°, 124° and 28° ✓
- Right-angled triangle⇔30°, 60° and 90° ✓
- Equilateral triangle⇔60°, 60° and 60° ✓
- How many lines of symmetry does a rhombus have?
- 0
- 1
- 2 ✓
- 3
- 4
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- The missing angle in this triangle is ______°.
- '47' ✓
- Select all of the properties of a rhombus.
- It has three equal edges.
- It has equal edges. ✓
- It has four interior angles. ✓
- It has one set of parallel sides.
- Opposite angles are equal. ✓
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- Which of these is not a construction of a rhombus?
Exit quiz
- To ______ means to cut or divide an object into two equal parts.
- 'bisect' ✓
- How many of the altitudes of an isosceles are also a line of symmetry?
- 0
- 1 ✓
- 2
- 3
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- The diagonals of a rhombus ...
- ...are perpendicular to each other. ✓
- ...bisect each other. ✓
- ...are always equal in length.
- ...bisect the angle they pass through. ✓
- ...cannot be vertical or horizontal.
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- In this diagram of a rhombus and its diagonals, the angle marked b is ______°.
- '116' ✓
- Which of the following statements are true about this image?
- ✓
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-
- ✓
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- A rhombus has diagonals with lengths of 8 cm and 12 cm. Which of the following calculations will work out the area of the rhombus?
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- ✓
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- ✓
- ✓
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Worksheet
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Presentation
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Lesson Details
Key learning points
- An isosceles triangle has a line of symmetry that splits it into two congruent triangles.
- In a rhombus each diagonal splits the rhombus into two congruent isosceles triangles bisecting the angles.
- The two diagonals meet at right angles.
- The two diagonals bisect each other.
Common misconception
Pupils may struggle with a diagonal of a shape being vertical or horizontal.
By reminding pupils of the definition, ask them to check if it fits and the shape could be rotated as well.
Keywords
Bisect - To bisect means to cut or divide an object into two equal parts.
Altitude - The altitude of a triangle is a line segment from a vertex of a triangle to the opposite edge. It is perpendicular to that edge.
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