Find the area of the red triangle

Find the area of the red triangle

Find the area of the red triangle.

Answer:9

To solve this fun maths question, you need to understand how the area of a parallelogram works. If you already know how the area of a parallelogram and the area of a triangle are related, then adding 79 and 10 and subsequently subtracting 72 and 8 to get 9 should make sense.