Photo frame

A square-shaped 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 answer:

b =  28 cm

Step-by-step explanation:

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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It look so simple

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