Question

plz help by solving this​

Answer 1

answer of first part is 12 cm

perimeter of 2 part is 20 cm

and of last and third part answer is 24

a) add all the sides ( 3cm + 4cm + 5cm )

ans - 20 cm

b) add all the sides ( 3cm + 3cm + 5cm +2 cm )

but here two sides are Missing and the first one is 3cm + 2 cm = 5cm and 2nd missing side is 5cm -3cm = 2 cm

now ( 3cm + 3cm + 5cm +2cm + 5cm + 2cm )

ans is 20 cm

c) here parallel sides are same so ( 7cm + 7cm + 5cm +5cm )

ans is 24 cm

Formula is also here !!

2(l+b)

= 2× length + breadth