Question

Solve similar triangles (advanced)

Answer 1

x = 12

Explanation:

ABC ~ ADE

AB/AD = BC/DE

10/20 = 6/x

x = 20 x 6 ÷ 10

x = 12

Answer 2

12 =x

Explanation:

We can use proportions to solve

6 x

---- = -------

10 10+10

Using cross products

6 ( 10+10) = x*10

6*20 = 10x

120 = 10x

Divide by 10

120/10 = x

12 =x