Question

Please Help me please I will give you brainly and 30 points

Answer 1

Dear ,

Please do with Pythagoras theorem.

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Answer 2

Step-by-step explanation:

$ratio~of~sides~of~ Similar~triangle~are~equal\\so\frac{21}{18}=\frac{14}{?}\\\\\frac{7}{6}=\frac{14}{x}\\\\ratio~of~14~also~7\\=14/7=2(one ~ratio~=2)\\missing~side~(x)=6\\one ~ratio=2\\ratio~6~=12\\12mm~is~the~answer$

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