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Answer 1

Answer:

Here is your answer

Step-by-step explanation:

Ab= 18 m

cd= 13 m

bd= 12 m

find ac

construction = draw a line ce parallel to bd

it means ebcd is rectangle 

then ec = 12 m 

angle aec= 90 

ea =ab-eb

  =18 m - 13 m

  = 5 m

ea =5 m

ea^2+ec^2=ac^2

(5m)^2+(12m)^2=ac^2

(25+144)m^2=ac^2

ac^2=169m^2

square rooting both side

ac=13m

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Answer 2

Answer:

this is your answer hope it helps you