Could be italic or possibly copperplate.
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Well, when the slopes of the perpendicular sides of the right triangle are mutiplied, the result should be -1.
Italian
Positve slopes increase on the chart and negative decreases. Positive increase from 0 to the top right corner of the chart.
a verticla line
If two lines in the same plane intersect to form a right angle, then their slopes are negative reciprocals. Representing their slopes by sa and sb, then sa = -1/sb .