The radius of a circle is 3 cm what is the circumference
1 answer:
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Answer:
a = ± 4
Step-by-step explanation:
Expressing the proportion in fractional form
=
( cross- multiply )
(a -1 )(a + 1) = 15 ← expand factors on left side
a² - 1 = 15 ( add 1 to both sides )
a² = 16 ( take the square root of both sides )
a = ± = ± 4