129. We denote GvPGas the velocity of the plane relative to the ground,GvAGas the velocity of the air relative to the ground, and GvPAas the velocity of the plane relative to the air. (a) The vector diagram is shown on the right: GGGvvvPGPAAG=+.Since the magnitudes vPGand vPAare equal the triangle is isosceles, with two sides of equal length. Consider either of the right triangles formed when the bisector ofθis drawn (the dashed line). It bisects Gv, so ()AGPG70.0 mi/hsin/ 222 135 mi/hvv==which leads to
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