Question

draw a rectangle of perimeter 30 cm length of side in the ratio of 1 is to 2 draw two more rectangles of the same perimeter with length of sides in the ratio 2:3 and 3:7 computer the areas of all three rectangles​

Answer 1

Ratio 1:2

length=10cm

breath=5cm

ratio breadth/length=5/10=1/2

perimeter=2(length+breadth)

=2(5+10)

=2×15=30cm

area=length×breadth=10×5=50squarecm

Ratio 2:3

length=9cm

cmbreath=6cm

cmratio breadth/length=6/9=2/3

perimeter=2(length+breadth)

perimeter=2(length+breadth) =2(9+6)

) =2×15=30cm

=30cmarea=length×breadth=9×6=54squarecm

Ratio 3:7

length=10.5cm

cmbreath=4.5cm

cmratio breadth/length=4.5/10.5=450/105=3/7

perimeter=2(length+breadth)

perimeter=2(length+breadth) =2(10.5+4.5)

) =2×15=30cm

) =2×15=30cmarea=length×breadth=10.5×4.5=47.25squarecm