Eighty-one thousand two hundred seventy-one.
0.5 unit per unit (or any other label)
I think it is 138 degrees. 180 (angles in a straight line) minus 42 degrees=138. Sorry if I’m wrong!
Altitude=√3a/2=12(a the side of the equilateral triangle)
a=24/√3=8√3cm
perimetre=3a=3*8√3=24√3cm
Answer:
units
Step-by-step explanation:
Recall that the area of a sector is
where
is the radius and
is the angle of the sector (measured in radians).
Therefore, the radius of the sector is:








So, the radius of the sector is
units.