Changing Dimensions Proportionally

If a rectangle has an area of 48 cm², what would be the area of   a similar rectangle if the dimensions are doubled?

• 96 cm²
• 192 cm²
• 216 cm²
• 2304 cm²

If a rectangle is drawn and another rectangle is drawn so that the sides are twice as big as the first rectangle, what happens to the area?

• doubles
• triples
• quadruples
• not enough information

What happens to the perimeter of a square if the sides are    halved?

• doubles
• halved
• quadrupled
• forthed

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (5,3), (6,2), (1,-2)
• (6,0), (9,-3), (-6,-15)
• (2/3,0), (1,-1/3), (-2/3,-5/3)
• (-1,-3), (0,-4), (-5,-8)

What is Dilation?

• Dilation means to enlarge or reduce
• Dilation means to reflect on something
• Dilation means to like something
• Dilation means to make something different by making it smaller

• The perimeter of the new rectangle will be the same as the perimeter of the original rectangle.
• The perimeter of the new rectangle will be 2.5 times as large as the perimeter of the original rectangle.
• The perimeter of the new rectangle will be 5 times as large as the perimeter of the original rectangle.

Find the perimeter of the large triangle.

• 24
• 36
• 12
• 54

If a rectangle has an area of 48 cm², what would be the area of   a similar rectangle if the dimensions are doubled?

• 96 cm²
• 192 cm²
• 216 cm²
• 2304 cm²

What happens to the perimeter of a square if the sides are    halved?

• doubles
• halved
• quadrupled
• forthed

Suppose the dimensions of a pentagon with an area of 12 are tripled Find the area of the new pentagon in square inches.

• 108
• 36
• 72
• 144