Keliling irisan lingkaran X²+y²=100 dan x²+(y-10)²=100 adalah ...

Keliling lingkaran = 2πr
π = 22/7
r =?

x² + y² = 100
x² + (y - 10)² = 100
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x⁴ + y⁴ - 100 = 200
x⁴ + y⁴ = 200 + 100
x⁴ + y⁴ = 300

300 - x⁴ = 300 - y⁴
r = ½ (x⁴ + y⁴)
r = x² + y²

K.L. = 2πr
K.L. = 2.22/7.x² + y²
K.L. = 44/7.x² + y²
K.L. = 44x² + y²/7
K.L = ½. 44 + y²/7
K.L = 22 + y²/7
K.L = 22 + 7y
K. L<=> 7y = 22
K. L<=> y = 22/7
K. L<=> y = 2,74cm


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