Photo frame

A square shape photo with a side length of 20 cm is framed by a 4 cm wide bar. Find the external frame size of this photo (the frame is from all sides)

Correct result:

b =  28 cm

Solution:

a=20 m r=4 cm  S1=a a S2=b b  b=a+2 r=20+2 4=28 cm



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