BD is half the length of AD ( 18 is half of 36)
BE would be half of EC
EC = 42, so BE would be 42/2 = 21
a = 21
Answer:
222! thats your answer!
Step-by-step explanation:
To change a degree measure to a radian measure, we multiply by (π/180). So 360° becomes 2π radians, and 240° becomes 4π/3.