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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