Sum of two angles of a parallelogram is 70 degrees. Find all angles.

1. A, B, C, D – the tops of the parallelogram. ∠А + ∠С = 70 °.

2. In a parallelogram, the angles opposite each other are equal. ∠А = ∠С = 70 °: 2 = 35 °.

3. According to one of the properties of the parallelogram, the total value of the angles located on

one side is 180 °. Using it, we calculate the degree measure ∠В:

∠В = 180 ° – ∠А = 180 ° – 35 ° = 145 °.

4. ∠D is also equal to 145 °, since it is opposite to ∠В.

Answer: ∠А = ∠С = 35 °, ∠В = ∠D = 145 °.