Answer: 69%
Step-by-step explanation:
10 cm
Find the area. [tex]A=s^2[/tex]
[tex]A=(10cm)^2\\A=100cm^2[/tex]
Now calculate the area when a side is lengthened by 3 cm.
10+3=13 cm
[tex]A=s^2\\A=(13cm)^2\\A=169cm^2[/tex]
Now calculate the difference.
[tex]169-100=69[/tex]
Divide it by the original number (100) and multiply by 100
[tex]\frac{69}{100}*100=69[/tex]
This is the increase.
