Are the angle of the bolded line the same? Is a quadrilateral with two vertices touching the circumference and another two lying within the cirlcle a cyclic quadrilateral? ( I'm asked to prove that it is and I have found the angle I stated from all given information ).
It is alright now, I have solved the question and my question stated above is a broken question.
I will scan when I'm free and post the question to share with other forumers here.