15. In a rectangle ABCD, find the value of x
А
B
5
(5x + 4 10
2x + 4
D
C
Answers
Answered by
1
Answer:
AD=BC
AB=DC
3x+2y−11=x+y+4
5x+2y+2=2x+5y−7
2x+y=15..........................eq(1) multiplied by 3
3x−3y=−9..............................eq(2)
on adding both equationswe get
6x+3y=45
3x−3y=−9
_____________________
9x=36
x=4
puting x=4 in eq(1)
2×4+y=15
y=7
AB=5x+2y+2
=5×4+2×7+2=20+14+2=36
BC=x+y+4
=4+7+4=15
So, perimetre =2(36+15)
=102
Area==36×15=540
Diagonal==
15
2
+36
2
=
1521
=39
so a b c points are correct.
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