ABCD is a square of side 20 cm. Find the area of blue coloured region formed by the semi-circles drawn on each side as shown in figure 13.26. (???? = 3.14)
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hi
I can just give u example
I can just give u example
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Answer:
228 cm^2
Area of ABCD =400cm^2
Length of AD = 20 cm
Radius of semi circle = 10cm
Area of semi circle = 1/2×π×r^2
= 157 cm^2
Shaded area = ABCD - ( Unshaded areas1+2+3+4 )
Area 1+3 =ABCD -Area of semicircle ( AD+BC)
Area 2+4 = ABCD-Area of semicircle (AB+CD)
Area 1+2+3+4 =2(ABCD)- Area of semi circles (AD+BC+AB+CD)
=2×400-(4×157)
=800-628
=172 cm^2
Area of shaded region = 400-172
=228 cm^2
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