norahramahi123
norahramahi123 norahramahi123
  • 15-12-2018
  • Mathematics
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plz help :)))))))))))

plz help class=

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iashwin2002osxh2c
iashwin2002osxh2c iashwin2002osxh2c
  • 15-12-2018

Given:

b1 = 17 ft

b2 = 20 ft

h = 13 ft

r = 17/2 = 8.5 ft


Area of the Semi-circle = 1/2 π r²

= 1/2 (22/7) (8.5²)

= (11/7) (72.25)

= 113.535 ft²


Area of the trapezium = (h) (b1 + b2) / 2

= (13)(17 + 20)/2

= 240.5 ft²


Total area of the amphitheater stage = Area of Semi-circle + Area of the trazezium = 113.535 + 240.5 = 354.035 ft²

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