tentukan keliling dari daerah yang diarsir pada daerah yang diarsir

k=
[tex]k = \frac{22}{7} \times {14}^{2} \times \frac{1}{2} = 308[/tex]

a. k = (2πr:2)+(2πr:2)+12cm
= (πr)+(πr)+12
= (3,14×12)+(3,14×6)+12
= 37, 68+18,84+12
= 68,52cm
b. k = (2×25)+14+(2πr:2)
= 50+14+(πr)
= 66+(22/7×7)
= 66+22
= 88cm
c. k = (2πr:2)+(2πr)
= (πr)+(2πr)
= (22/7×14)+(2×22/7×7)
= 44+44
= 88cm
d. k = (2(p+l))+(2πr)
= (2(25+2))+(2×3,14×2)
= (2×27)+(6,28×2)
= 54+12,56
= 66,56 cm