In a circle, what is the relationship between radius and diameter?
Ad = r
Bd = 2r
Cd = πr
Dr = 2d
Answer & Solution
Correct answer: B. d = 2r
Diameter is twice the radius: d = 2r. Equivalently, r = d/2.
Related questions
In a 30-60-90 right triangle, the side opposite the 30° angle has length 7. What is the leIf $ in(40°) = k$, what is $\cos(50°)$ in terms of $k$?In a right triangle, if $ in\theta = \frac{3}{5}$, what is the value of $\cos\theta$ (assuThe equation $(x - 3)^2 + (y + 2)^2 = 25$ represents a circle in the xy-plane. What are itA circle has radius 10. A sector of this circle has a central angle of 36°. What is the arA circle has a central angle of 60° subtending an arc of length 4 cm. What is the circumfeA rectangle has diagonal $5 qrt{5}$ and one side of length 5. What is the length of the otA right triangle has legs of length 9 and 12. What is the length of the hypotenuse?