A wire of length \( 7 x \) is bent into the shape of a circle. A. Express the circumference of the circle as a function of \( x \). B. Express the area of the circle as a function of \( x \). A. \( C(x)=\square \)

An equilateral triangle it's perimeter equals 27 cm , then it's side length is......

ABCD is a trapezoid where \( \overline{\mathrm{AB}} / / \overline{\mathrm{CD}}, \mathrm{A}(9,-2), \mathrm{B}(3,2) \) , \( \mathrm{C}(x,-x) \) and \( \mathrm{D}(4,-3) \) Find the coordinates of the point C

14. Find the radius of a hemisphere of volume \( 80 \mathrm{~cm}^{3} \)

Find the area of a parallelogram \( A B C D \) whose bese \( B C \) is 27 cm and altitude \( A E \) is 8 cm . If the lengh of the altitude \( A F \) to the base \( C D \) is 12 cm . Find \( C D \).

Si el perímetro de un círculo es \( 10 \pi \mathrm{~cm} \). ¿cuál es el área de su semicirculo?