Areas of Similar Shapes

What is the first step?

• Find the scale factor

• Multiply the Area

• Add them together

• I don't know

How do you find the area of the smaller shape?

• Multiple by 5

• Divide by 5

How you find the scale factor?

• Add them together

• 14 divided by 7

• 20 Divided by 7

• 20 Multiplied by 7

When I have the scale factor, how do I use it to find the area?

• Square root it and the multiply by area given

• Square it and the multiply by area given

• Double it and the multiply by area given

• Multiply it by area given

Tags

CCSS.7.G.A.1

What is the Area?

• 100

• 10

• 500

• 44.7

Tricky one!

• 18cm

• 6cm

• 9cm

• 4cm

The volumes of two similar solids are in the ratio 27:8

What is the ratio of the surface areas?

• 3:2

• 3:1

• 9:4

• 9:1

The surface areas of two similar solids are in the ratio 16:25

What is the ratio of the volumes?

• 4:5

• 16:25

• 64:125

• 32:50

The surface areas of two similar solids are in the ratio 4:1

What is the ratio of the volumes?

• 2:1

• 8:1

• 4:1

• 1:2

What is the ratio of the surface areas?

• 2:1

• 8:1

• 4:1

• 1:2

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3