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)

Result

b =  28 cm

Solution:

a=20 m r=4 cm  b=a+2⋅ r=20+2⋅ 4=28 cma=20 \ \text{m} \ \\ r=4 \ \text{cm} \ \\ \ \\ b=a + 2 \cdot \ r=20 + 2 \cdot \ 4=28 \ \text{cm}

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