Mathematics, 13.11.2020 07:00 719729

4 ) Here is an explanation that the angle sum of triangle ABC is 180º. The reasons for each line are missing.
Give the reasons.
1. Angle A of the triangle = angle PCA
2. Angle B of the triangle = angle QCB
3. Angle PCA + angle C of the triangle + angle QCB = 180°
Hence angle A + angle B+ angle C = 180°

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4 ) Here is an explanation that the angle sum of triangle ABC is 180º. The reasons for each line ar...