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a) 4x² + 4y² = 1
4(x² + y²) = 1
x² + y² = 1/4
r = √(1/4) = 1/2 satuan
d = 2 x 1/2 = 1 satuan
b) 1/2 x² + 1/2 y² - 5 = 0
1/2 (x² + y²) = 5
x² + y² = 5 / (1/2)
x² + y² = 10
r = √10 satuan
d = 2 x √10 = 2√10 satuan
c) 6 - 8x² - 8y² = 0
-8(x² + y²) = -6
x² + y² = -6/-8
x² + y² = 3/4
r = √(3/4) = 1/2 √3 satuan
d = 2 x 1/2 √3 = √3 satuan
d) 5x² = 7 - 5y²
5x² + 5y² = 7
5 (x² + y²) = 7
x² + y² = 7/5
r = √(7/5) = √7 / √5 x √5 / √5 = 1/5 √35 satuan
d = 2 x 1/5 √35 = 2/5 √35 satuan
semoga membantu ya :)