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π = L/r²
*karena π selalu sama
A)π = π
L/r² = L/r²
40/r² = L/(2r)²
40/r² = L/4r²
40 . 4 = L
160 cm²
B) π = π
L/r² = L/r²
40/r² = L/(1/2r)²
40/r² = L/(r²/4)
40/4 = L
10 cm² = L
^_^