What would you assume at the beginning of an indirect proof for the following? given: the swimming pool is full. prove: the temperature is above 90 degrees. a. the swimming pool is full. b. the swimming pool is not full. c. the temperature is above 90 degrees. d. the temperature is not above 90 degrees. complete the following direct proof. 1) triangles are the only polygons with three sides. 2) the polygon has three sides. a. the triangle is a polygon. b. the polygon is a triangle. c. the triangle has three sides. d. triangles are three-sided polygons. what would you assume at the beginning of an indirect proof for the following? given: it is raining. prove: the sky is cloudy. a. when it rains, the sky is cloudy. b. when the sky is cloudy, it rains. c. the sky is not cloudy. d. it is not raining.