Will mark brainliest if ! meg described four triangles as shown below: triangle p: all sides have length 7 cm. triangle q: two angles measure 55°. triangle r: two sides have length 8 cm, and the included angle measures 60°. triangle s: base has length 8 cm, and base angles measure 55°. which triangle is not a unique triangle? a) triangle p b) triangle q c) triangle r d) triangle s