# Video: KS2-M16 β’ Paper 3 β’ Question 17

Here are five triangles on a square grid. Four of the triangles have the same area. Which triangle has a different area?

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### Video Transcript

Here are five triangles on a square grid. Four of the triangles have the same area. Which triangle has a different area?

The area of a triangle is half base times height or the base times the height divided by two. Triangle π΄ has a base measuring one square and its height is five squares. Five times one is five, divided by two or five halved is 2.5. The base of triangle π΅ is one and its height is six. One times six is six and half of that is three.

Triangle πΆβs base is two and its height is three. Three times two is six. Half of that is three. The base of triangle π· is three; its height is two. Three times two is six and half of six is three. And triangle πΈ also has an area of three. Its base is two; its height is three. Two times three is six and a half of six is three.

So the triangle which has a different area is triangle π΄. It has an area of 2.5 squares. And all the other triangles have an area of three.