a circular photo frame has an outer radius 20 cm and inner radius 18 cm find the width of the frame around the photo also find the cost of painting it with a metallic colour at the rate of rupees 0.7 per CM square. pi 22 upon 7
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width of the frame = outer radius- inner radius
= 20 - 18 = 2cm
area of frame = π(R²-r²)
= 22/7 x (400-324)
= 22/7 x 76
= 22 x 185/100
= 40.7
Cost = area x rate
= 40.7 x 0.7
= $28.49
Hope This Helps :)
= 20 - 18 = 2cm
area of frame = π(R²-r²)
= 22/7 x (400-324)
= 22/7 x 76
= 22 x 185/100
= 40.7
Cost = area x rate
= 40.7 x 0.7
= $28.49
Hope This Helps :)
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