1. #8. Matthew is making a place mat for his mother as shown below.
2/5/1 OMG: to see how changes to dimensions of a shape changes its perimeter and area.
Homework: p. 261, #1 to 11.
Answer the following question taken directly from a HSA test. Show all work:
#8. Matthew is making a place mat for his mother as shown below.
His mother decided that she wants Matthew to triple the width. How does this change the area of the place mat?
10 inches
8 inches

2. What do you think will happen to the monkey?
monkey.mp4

3. Another HSA problem. To see the answer, you must do the work to see what happens!
#18. Mary has a picture with a perimeter of 24 inches. She wants to make a new picture by doubling the length and the width of her original picture.
What is the relationship of the new perimeter to the original perimeter?

4. Step #2: Draw a picture of the new shape with the new
Step #1: Draw a picture of the original shape with the given dimensions
on the left side of your paper.
Step #2: Draw a picture of the new shape with the new
dimensions on the right side of your paper.
Step #3: Write down the perimeter or area of the original shape.
Step #4: Find the perimeter or area of the new figure.
Step #5: Compare the results of original to new.
New Shape
12 in.
Original Shape
6 in.
12 in.
12 in.
6 in.
6 in.
New Perimeter
Is double the
Original!
6 in.
12 in.
Original perimeter is 24 inches
New perimeter is 48 inches

5. Problems to work on.
Jon has a garden that measures 4 feet by 6 feet. If Jon triples the width and length of his garden, what happens to the area?
Jeff has a wooden frame in the shape of an equilateral triangle. The perimeter is 24 inches. If he doubles each side, what happens to the perimeter?
Jen has a round garden that has a diameter of 5 feet. If she doubles the diameter, how much more fencing will she need?
Joe currently has a pool that has a radius of 4 feet. What happens to the area of his pool if he decides to expand the pool by doubling the radius?