上周末小宇同学参观了生态农业示范区,回来后兴致勃勃地画了一幅生态农业结构图,请据图回答下列问题:
∠A是锐角,且sinA=cosA,则∠A的度数是( )
— Excuse me. What's that in the picture?
— It's _____ orange hat.