Squared signed sum

Geometry Level 1

What is the value of

sin210+sin220+sin230+sin240+sin250+sin260+sin270+sin280? \sin ^2 10 ^ \circ + \sin ^2 20 ^ \circ + \sin ^2 30 ^ \circ + \sin ^2 40 ^ \circ + \sin ^2 50 ^ \circ + \sin ^2 60 ^ \circ + \sin ^2 70 ^ \circ + \sin ^2 80 ^ \circ ?

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