1. A roller-rink floor has a semi-circle in each end. The rectangle has a length of 70 feet and a width of 30 feet. The diameter of the semi-circle is the width of the rectangle. What is the area of a roller-rink floor?

2. Mr. Husi wants to put a circular pond with a diameter of 8 meters in his 16 by 20 meter rectangular backyard. How many square meters will be left in his backyard after putting up the pond?

3. A figure is made up of three triangles. Each triangle has a base of 8 inches and a height of 6 inches. What is the combined area of all three triangles?​

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