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L 2 lingkaran = 2 . phi . r2 (r kuadrat)
= 2 . 22/7 . 12 . 12
= 905,14 cm
L persegi = s . s
= 24 . 24
= 576 cm
L seluruhnya = L 2 lingkaran + L persegi
= 905,14 cm + 576 cm
= 1481,14 cm
4. Panjang busur = sudut dik/360 x K lingkaran
11 cm = 45/360 x K lingkaran
11 cm = 1/8 x K lingkaran
11 cm x 8 = K lingkaran
88 cm = K lingkaran
K lingkaran = 2 . phi . r
88 cm = 2 . 22/7 . r
88 cm = 44/7 . r
88 cm x 7 / 44 = r
2 cm x 7 = r
14 cm = r