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K = 2 × { a + b }
=>> 2 × { 28 + 35 }
=>> 2 × 63
=>> 126 cm
jawabannya adalah { b }
25)
L = π r ^2
lingkarannya ada 1/4 bagian maka
L =>> 1/4 × π r ^2
=>> 1/4 × 22/7 × 28 × 28
=>> 1/4 × 2.464
=>> 616 cm2
jawabannya adalah { d }