Question

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 @ rupees 0.7 per CM square. pi 22 upon 7

Answer 1

Area of outer frame=pi×400
Area of inner frame=pi×324
Net area=400pi-324pi=76pi=76×22/7=Rs 238.86 (approx)
Cost of painting=0.7×238.86=Rs 167.202
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