(a)
we are given
length of rectangle is 3cm

width of rectangle is 4cm

now, we can use area formula

we can plug values


Let's assume side of square is 'a'

we can set them equal
and then we can solve for a

..........Answer
(b)
we are given
length of cuboid is 2cm
so,

width of cuboid is 4cm
so,

height of cuboid is 5cm
so,

now, we can find volume

now, we can plug values


Let's assume edge of cube is 'a'
so, volume is

now, we can set them equal
and then we can solve for a

...........Answer