Help, you've been mummified. Use your geometry skills to build a path across the voids, and escape from the pyramid, staying ahead of the mongrel demon Ammit. Battle skull bats and skeleton thieves with your ankh cross.

Calculate the area of a triangle using the base length multiplied by the perpendicular height, then divided by 2. Include reverse problems e.g. find the perimeter or some side given the area. Derive the formula by considering the rectangle being halved.