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2) Draw bisectors of the angles given.Here,you need to draw 105°/2 = 52.5° and 30°/2 =15° from the ends of the segment.

3) Elongate them till they meet at a point. Say, this point is R.

4) Draw perpendicular bisectors for both the sides.

5) Elongate both the perpendicular bisectors till they meet at the base. These are points P and Q.

6) Join P and Q to R.

7) ∆PQR is complete.

Yay! We completed the construction.Recheck it by measuring the angles and the perimeter.

2-at A construct 105°

3-at B construct 30°

4-draw the angle bisector of angle a&b

5-extend the line as ax and by(mark the meeeting point as p)

6-draw the perpendicular bisector of AX and BY

7-mark the point where perpendicular bisectors of AX and BY as q and r

8-join PQR

9- pq+qr+pr=12.5cm

10-pqr is the required triangle