Answer:
C
Step-by-step explanation:
The circumference (C) of a circle = 2πr ← r is the radius
Given C = 15π the equating gives
2πr = 15π ( divide both sides by 2π )
r = = 7.5 cm
The area (A) of a circle is calculated using the formula
A = πr² = π × 7.5² = 56.25π cm² → C
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Answer:
A. There is a focus at (0,−10).
Step-by-step explanation:
Assume the hyperbola is like the one below.
The hyperbola is vertical and centred on the y-axis, so its general equation is
The vertices of your parabola are (0,±8) so a = 8.
The covertices are (±6,0), so b = 6.
Calculate c
A. Foci
The foci are at (0, ±c) = (0, ±10)
TRUE. There is a focus at (0,-10).
B. Foci
The foci are at (0,±10).
False. There is no focus at (0,12)
C. and D. Asymptotes
The equations for the asymptotes are
So, y = ±x are not asymptotes.
False.
E. and F. Directrices
The equations of the directrices are
y = ±a²/c = ±64/10 = ±6.4
y = 6.4 is a directrix.
E is false. x = cannot be a directrix
F is uncertain. Your equation for the directrix is incomplete.
