Given triangles ABC, angle C = 90 degrees, angle A = 40 degrees, CD perpendicular to AB, find the angle ACD.
| December 19, 2020 | education
consider the AСD triangle:
СD – height (according to conv.), Therefore the AСD triangle is rectangular.
angle AСD = 180-90-20 = 70 degrees (by the sum of the angles of the triangle)
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