Question

the dimensions of a photograph are 25cm×12cm.what length of wooden frame is needed to frame the photograph ?

Answer 1

Hey dear!!
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Dimensions of the photograph = 25 cm × 12 cm
Length of frame needed to frame the picture = perimeter of the picture 

= 2(l+b)
= 2(25 + 12)
= 2 × 37
= 74 cm

Therefore, length of frame needed to frame the picture is 74cm. 
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Hope helped!!

Answer 2

the lenght required is the perimeter of photo frame so
2(l+b)=2*(25+12)
         =2*37
         =74 cm
So you need 74 cm