Batman and Robin are in the Batcave. They receive two calls for help from citizens of Gotham City  who are in trouble. Batman goes out to the citizen who is 13.5 km away and Robin goes out to a  citizen who is 7.9 km away. If the citizens in trouble are 18.6 km apart, find the angle between the 2  citizens in trouble if measured from the Batcave. Round to the nearest angle.

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