A small social network contains seven people who are network friends with six other people in the network, one person who is network friends with five other people in the network, and three people who are network friends with four other people in the network. The rest are network friends with three other people in the network. The network contains 52 pairs of network friends.(a) How many people are network friends with three other people in the network? (b) How many people are in the network?

With these 5 geometry questions! pls 1.)quadrilateral abcd is inscribed in this circle.what is the measure of ∠a ? enter your answer in the box.°2.)quadrilateral abcd is inscribed in a circle.what is the measure of angle a? enter your answer in the box.m∠a= 3.)quadrilateral abcd is inscribed in this circle.what is the measure of angle b? enter your answer in the box.m∠b= °4.)quadrilateral abcd is inscribed in this circle.what is the measure of angle a? enter your answer in the box.°5.) quadrilateral abcd is inscribed in this circle.what is the measure of angle c? enter your answer in the box.°