Wings that are straight-edged are stable at low airspeeds. However, they produce a lot of drag and limit the airspeed. Wings that are swept back have less drag and are capable of greater speed, but they are unstable at low speed.
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A biplane has two main wings, one above the other. This is mainly on older planes though.
none of the above.
wich shaps have right angles
Draw Or Make 2 Lines Above Each Other Like This: ___________ ___________
They are named after the man who invented them, it is said that he was sick, lying in bed watching a fly zig zag above him and he realised he could plot the location of the fly on a plane marked with co-ordinates.