The measure of an arc is twice the measure of the inscribed angle that intercepts it.
m(arc)NL = 2 * 42 = 84
Answer
Find out the what fraction of the sandcastle did they build together .
To prove
Let us assume that the fraction of the sandcastle they build together be x .
As given


Than the equation becomes

L.C .M of (3,7) = 21
solving


Therefore the fraction of the sandcastle did they build together be

Hence proved
Answer:
asked in hindi plese
byt can you mark in briliant point
Chlorine atom has 7 electrons in their valence shell