Rong...averaej distans from erth tu moon =384,400 km (238,900 mile)
angel=0.516 degree...is small nuf, us kan simplifi tan(angel)=sine(angel)=angel
in Radians
1 pi=180 deg, or 1 radian=57.295779513082320 deg
so 0.516 deg=0.0090059 radians
0.009006*384,400=3,462 km for diameter av Moon
astronomy book sae moon rad=1,737.1 km, giv diameter=3,474.2