A mirrior with radius 49 cm has a wooden frame of a thickness 70 mm .how much area of the mirror is covered with frame .wht is the visiable area of the mirror
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First convert the mm to cm.
10mm = 1 cm
70/10 = 7 cm
In this case we have the outer circle and the inner circle.
The radius of the outer is :
49 + 7 = 56cm
Area of a circle = 22/7r^2
Area of outer circle = 22/7 × 56 × 56 = 9856 cm squared
Area of inner circle = 22/7 × 49 × 49 = 7546 cm squared
Area of the frame = 9856 - 7546 = 2310
Area covered by the frame = 2310
Visible area = 7546
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