Which formula should be used to find the circumference of a circle

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=0

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

In the diagram below,abc is congruent to dec what is the value of x