Plz help plz Which three side lengths best describe the triangle in the diagram?

A. 5 cm, 6 cm, and 7 cm

B. 5 cm, 5 cm, and 7cm

C. 5 cm, 7 cm, and 7 cm

D. 5 cm, 5 cm, and 8 cm

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.°