Answer:
The missing side is 15
Explanation:
you know that 1 long side is 35 cm so you add 35+35 to get 70
then you subtract 70 fron 100 to get 30
then you divide 30 in 2
perimeter of the rectangle=100cm
or. 2(l+b)=100cm
or. 2(35+b)=100cm
or 70+2b=100cm
or. 2b=100cm-70cm
or. 2b=20xm
or. b=20cm/2
. b=10cm
missing length of rectangle=10cm
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