Mr. Martin is making a swimming pool in his garden. He has three options, he can either make a triangular swimming pool or a circular swimming pool. In the remaining section outside the swimming pool, he will plant grass seeds to have nice green grass outside the swimming pool area. He will need to work out how much he would have to pay for the grass seed if grass seed comes in bags that cover 20 m2 and costs $10. Your task is to work out which option is cheaper for him. Make diagrams and show clearly how you calculate the area and work out the price of grass seed under each option and finally decide which is the better option.