32. The area of a rectangular piece of cardboard is 72 square metres and its width is 9 cm.
what is the length of the cardboard. Also find its perimeter.
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Step-by-step explanation:
ΔABC∼ΔDEF
Ar(ΔDEF)
Ar(ΔABC)
=(
EF
BC
)
2
Ar(ΔDEF)
54
=
4×4
3×3
Ar(ΔDEF)=6×16ΔABC∼ΔDEF
Ar(ΔDEF)
Ar(ΔABC)
=(
EF
BC
)
2
540 m2
Ar(ΔDEF)
54
=
4×4
3×3
Ar(ΔDEF)=6×16
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