Question

find the height of the tree. 19 20 21 5

Explanation:

Step1: Use similar triangles property

Let the height of the tree be \( h \). The two triangles are similar. So, \(\frac{h}{400}=\frac{10}{190 + 10}\)

Step2: Solve the equation

Simplify the denominator \(190+10 = 200\). Then \(h=\frac{400\times10}{200}\)
Calculate \(400\times10 = 4000\), and \(4000\div200=20\)

Answer:

20