Question

एक 18cm व्यास वाली प्लेट के किनारे पर अंदर की ओर 4cm चौड़ाई का डिजाइन बना हुआ है। डिजाइन वाले भाग का छेत्रफल ज्ञात कीजिए।

Answer 1

Answer:

Required area = 176 cm²

Step-by-step explanation:

Given that the diameter of the circular plate is 18 cm

Then its radius be (18 / 2) cm = 9 cm

So the area of the circular plate

= π * 9² cm²

= 81π cm²

Given that the designed portion is 4 cm wide

Then the area of the portion of the plate without the designed portion is

= π * (9 - 4)² cm²

= 25π cm²

Therefore the area of the designed portion is

= (81π - 25π) cm²

= 56π cm²

= (56 * 22 / 7) cm²

= 176 cm²