[填空题]
A windscreen wiper blade has a lengt8z 6;y,z 0o eszkenzd(m5kcj6.by h;qvti7qx 2 p:c/eh of 0.45 m. When it's raining and the blade is in motion, it moves thrc7/b2;vq yqp:i . xhetough an arc angle of $\dfrac {3\pi} 4$ radians.
1.Determine the area of the windscreen wiped by the blade. $m^2$
2.Determine the arc length travelled by the outer edge of the blade. m
