what is the answer to this
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16. B [x+2y=11] ,(1,5)
[1+2(5)=11]
[1+10=11]
17. A [ Area of euilateral triangle=√3/4a^2]
=√3/4×12×12
=36√3cm^2
18. D
19. C
20. D [Perimeter= sum of all angles
=20+15+9
=44
Semi-perimeter= Perimeter/2
= 44/2
=22
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