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1. Warmup Class Activity 12A If available, square centimeter tiles would be helpful. 1. What does it mean to say that a shape has an area of 15 square centimeters? 2. The large rectangle shown here is 3 cm by 5 cm. What is a primitive way to determine the area of the rectangle in square centimeters by relying directly on the meaning of area? A 1-cm-by- 1-cm square of area 1 cm- 3. In Chapter 4, we defined multiplication in terms of equal groups. According to our defi- nition, 3 - 5 means the number of units in 3 groups of 5 units each. Using our definition of multiplication, explain why the area of the large rectangle in part 2 is 3 . 5 cm?. 4. The length times width area formula for rectangles involves lengths, but doesn't explica itly involve equal groups. Discuss: How are the lengths 3 cm and 5 cm linked to yet different from the numbers of groups and numbers of things in each group in your explanation for part 3?5. a. Given that the line segment shown is 1 unit long, use the grid to lightly shade a rectangle that is to units by 10 units. -1 unit b. Apply the length times width formula to find the area of the shaded rectangle in part (a) and verify that the formula gives you the correct area for your rectangle. Attend care- fully to units of area.2. The concepts here apply even to fractional lengths... Calculate the area using the length times width formula. Show how this makes sense using the definition of multiplication. 25 cm- 3- cm