What is the value of x in trapezoid ABCD?
OX=15
OX-20
OX=45
OX=60
![What is the value of x in trapezoid ABCD OX15 OX20 OX45 OX60 class=](https://us-static.z-dn.net/files/d4b/9df423d77043bbf135aa9839e7b177ae.png)
Answer:
15.
Step-by-step explanation:
1) property:
m(∠B)+m(∠D)=180°;
2) according to the property:
3x+9x=180°; ⇒ x=15°