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Rectangle Diagonals and Area

ACTMAT-YJN13S

What is the area of a rectangle whose diagonals (each 12 cm long) intersect at a $60°$ angle, in square centimeters?

A

$36$

B

$72$

C

$144$

D

$ {36\sqrt { 3 } } $

E

$ {72\sqrt { 3 } } $