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(B) 270

because a3+a6=45+45=90

a4+a2=90 (complementary angles)

a5+a1=90 (complementary angles)

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a3+a6=90

Since the grid is a mirror image-

a1+a5=90
a2+a4=90

so, a1+a2+a3+a4+a5+a6=90+90+90=270

so, answer is (b) 270

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