Question

In the trapezium ABCD ,side AB || side DC . AM is linear to DC and BN is linear to DC . If l ( AB ) = 20, l ( BC ) = 13 , l ( NC ) = 5 , l ( AD ) = 15 then l ( DC ) = ?

Answer 1

Answer:

the answer is 34.

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Answer 2

Answer:

34

Step-by-step explanation:

bc²=nc²+bn²

13²=5²+bn²

bn²=13²-5²

bn=√169-25

bn=√144

bn=12

now

bn=am=12cm

ad²=dm²+am²

15²+dm²+12²

dm²=15²-12²

dm=√225-144

dm=√81

dm=9

now

DC=dm+MN+ NC

DC=9+20+5

DC=34cm

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