Answer:
70°
Step-by-step explanation:
If arc BY is 40, angle BAY is 20.
BAC is 90.
90-20 is 70.
m<YAC=70
You first have to find the length of each side.
AB=4
BC=4
CD=4
AD=4
Since this is a quadrilateral, two sides will have the same length, in this case, they all do so you can pick any two sides.
4(4)=16.
To add 1/2 and 1/4 you need a common denominator. The common denominator is 4. Multiply 1/2 × 2/2 and you get 2/4
Now you have 6 2/4 + 2 1/4
6+2=8 and 2/4+1/4=3/4
Your answer is 8 3/4 or 8.75