# Area of triangles

## Lesson details

### Key learning points

1. In this lesson, we will learn to calculate the area of triangles and link the area of triangles to the area of parallelograms.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
Fill in the gaps, in the correct order: The area of a parallelogram is equivalent to the area of a ____________ with the same width and _______________ height.
rectangle, slant
triangle, perpendicular
triangle, slant
Q2.
Find the area of this parallelogram.
16 cm
16 cm²
32 cm²
Q3.
Find the area of this parallelogram.
145 cm²
25 cm
50 cm
Q4.
Find the area of this parallelogram.
672 m²
84 m²
96 m²
Q5.
Find the area of this parallelogram.
0.375 m²
3.375 m²
6.75 m²

## Exit quiz

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### 5 Questions

Q1.
Fill in the gap: We can find the area of a triangle using the width of a base and the __________ height.
parallel
parallelogram
slant
Q2.
Fill in the gap: The triangle will have half the area of the _______________ formed with the same dimensions.
parallel
perpendicular
slant
Q3.
Find the area of this right-angled triangle.
B - 20cm²
C - 30cm²
D - 60cm²
Q4.
A triangle has a base of 3cm and a perpendicular height of 4cm. What is its area?
1.5 cm²
12 cm²
2 cm²