Steps of Construction:1. Draw a line segment AB=11 cm. (=PQ+QR+RP).2. At A, construct an angle of 30∘ and at B, an angle of 90∘.3. Bisect these angles. Let the bisectors of these angles intersect at a point P.4. Draw perpendicular bisectors DE of AP to intersect AB at Q and FG of PB to intersect AB at R.5. Join PQ and PR. Then, PQR is the required triangle.