Perimeter and Area Dimension Changes

A rectangle has a base of 10 mm and a height of 6 mm, and we double the height, what is the new perimeter and area?

• Perimeter = 22 mm and Area = 120 mm

• Perimeter = 44 mm and Area = 120 mm

• Perimeter = 32 mm and Area = 240 mm

• Perimeter = 32 mm and Area = 240 mm

A triangle has a perimeter of 16 cm and an area of 12 cm^2. If the dimensions are doubled what is the new perimeter and area?

• P =32 cm and A = 24 cm²

• P = 32 cm and A = 48 cm²

• P = 24 cm and A = 24 cm²

• P = 24 cm and 48 cm²

A pentagon has an area of 25 ft², the sides are tripled what is the new area?

• A = 75 ft²

• 100 ft²

• 200 ft²

• 225 ft ²

When the dimensions of a figure are changed by a scale factor of 3, what happens to the perimeter?

• The perimeter will be multiplied by 3

• The perimeter will be 3 more than the preimage

• The perimeter will be multiplied by 9

• There is no way to know, we don't have the measurements

The measurements of a hexagon are changed by a scale factor of 4, what will happen to the area?

• The area will be multiplied by a factor of 4

• The area will be multiplied by a factor of 8

• The area will be multiplied by a factor of 16

• We cannot determine the new area

The figures below are similar. The labeled sides are corresponding.

What is the perimeter of the smaller hexagon?

• 5 cm

• 1/6 cm

• 6 cm

• not enough info

The figures below are similar. The labeled sides are corresponding.

What is the ratio of the perimeter of the smaller pentagon to the larger pentagon?

• 9:5

• 25:81

• 5:9

• 81:25

The figures below are similar. The labeled sides are corresponding.

What is the perimeter of the smaller triangle?

• 23.8 mm

• 10.2 mm

• 6.67 mm

• 4.3 mm

The figures below are similar. The labeled sides are corresponding.

If the ratio of the squares' perimeters is 8:3, what is the value of x?

• 8 mm

• 4.5 mm

• 12 mm

• 36 mm

The figures below are similar. The labeled sides are corresponding.

What is the area of the larger square?

• 25 m²

• 1.25 m²

• 20 m²

• 16 m²