Mathematics, 01.07.2020 21:01, xxtonixwilsonxx

If angle C is a right angle and angle A equals 50°, then prove that the measure of angle B equals 40° Which of the following would be the first step to assume in order to prove the statement above by contradiction using an indirect proof?
Angle C is a right angle.
Angle C is not a right angle.
The measure of angle A equals 50°
The measure of angie B does not equal 40°
The measure of angle B equals 40°

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If angle C is a right angle and angle A equals 50°, then prove that the measure of angle B equals 40...