Writing the Standard Equation of a circle

Write the equation of a circle with a center  $\left(0,0\right)\$  and a radius of 9 

Find the center of a circle with an equation of  $x^2-2x+1+y^2+6y+9=16$  Write the center using parenthesis

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(a)  

Given the equation, check the all the correct answers that correspond to the equation
 $x^2+4x+4+y^2+2y+2\ =36$  

Given the equation, check the all the correct answers that correspond to the equation
 $x^2-6x+9+y^2=4$  

Find the center and radius given the equation
 $\left(x-5\right)^2+\left(y+1\right)^2=25$  

Find the center and radius given the equation
 $\left(x-3\right)^2+\left(y-5\right)^2=49$  

Factor the perfect square trinomial
 $x^2+10x+25$  

Factor the perfect square trinomial
 $x^2-12x+36$  

Factor the perfect square trinomial
 $x^2-18x+81$  

Review for Finals  $\angle A\ and\ \angle B\ are\ complementary,$  
 $\ \angle A=\left(x-10\right)\degree,\ \angle B=\left(4x-10\right)\degree.\$  
 $Find\ the\ value\ of\ \angle A.\$