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Step-by-step explanation:
question 3:
circumference of circle =2pi r
=2×3.14×25
=2×78.5
=157
360º-38º
hence,
157 -?
=157×38/360
=16.57 cm
arc AB= 16.57 cm.
question 4:
perimeter of semicircle =pi r + 2 r
=3.14×6.1+12.2
=31.354 cm.
hope it is helpful.
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