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Thank you! The visual really helped. We understand now 🙏😁

 

 

 

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By inspections, the perimeter is made up of (5/4)* perimeter of a circle with radius 28 cm, 2 * perimeter of a circle with 14 cm, and 2 * 28 cm = 56 cm straight line. 

Perimeter of the shaded area 

= (5/4)( 2 * 28 * 22/7 ) + 2 * 2 * 14 * 22/7 + 56 cm

= 220 + 176 + 56 cm

= 452 cm 

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Thank you!

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