Area in Similar Shapes

• $40cm^2$

• $80cm^2$

• $60cm^2$

• $20cm^2$

• $42cm^2$

• $63cm^2$
  

• $1176cm^2$
  

• $56cm^2$
  

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

• Divide by $5^2$

• Multiply by $5^2$

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

What is the Area?

• 100

• 10

• 500

• 44.7

Tricky one!

• 18cm

• 6cm

• 9cm

• 4cm

The side lengths of two similar solids are in the ratio 1:3

What is the ratio of the areas?

• 1:9

• 1:27

• 1:6

• 1:18

The side lengths of two similar solids are in the ratio 1:2

What is the ratio of the areas?

• 1:4

• 1:8

• 2:4

• 2:8