A random sample of 20 watermelon seeds is harvested from each of 4 different varieties of watermelons. Within each variety, 10 seeds are randomly chosen to be soaked in water for 24 hours before being planted in individual seed starting trays. The remaining 10 seeds from each variety are simply planted individually in seed starting trays. After one week the heights of the seedlings are measured. What type of study design is this?

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.°