Draw a line from the pole to the equator at 0º longitude, then from the pole to equator at 90º longitude, now connect the two points on the equator. The triangle covers a quarter of the northern hemisphere and has three 90º angles.
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Sorry about the reformat, posting it as a poem, runs several words together.
Draw a line from the pole to the equator at 0º longitude, then from the pole to equator at 90º longitude, now connect the two points on the equator. The triangle covers a quarter of the northern hemisphere and has three 90º angles.