Knowledge and skill questions 1 and 2 (to process) in mathematics book p73, Volume 2, Grade 7 Question: as shown in the figure AB, the parallel CD angle a is equal to 45 degrees, the angle D is equal to the angle c, and the degree of the angle c and the angle B in turn
It can be seen from the conditions
Because AB / / CD and angle d = angle C
The quadrilateral ABCD is isosceles trapezoid
That is, angle a = angle B, angle c = angle D, angle a + angle d = 180 degrees, angle B + angle c = 180 degrees
Because angle a equals 45 degrees, angle c = 135 degrees and angle B = 45 degrees
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