 Hi and welcome to the session. Today we will learn construction of a triangle when the lengths of two sides and the measure of the angle between them are known. That is SAS Criterion. Let us construct a triangle ABC in which AB is equal to 5 centimeters, AC is equal to 4.3 centimeters and angle A is equal to 60 degrees. First of all let us draw the rough sketch of triangle ABC and mark all the measurements given here. So here is the rough sketch of triangle ABC. We are given AB is equal to 5 centimeters, AC is equal to 4.3 centimeters and angle A is equal to 60 degrees. Now let us start the construction of triangle ABC. First of all we have AB is equal to 5 centimeters. So let us draw a line segment AB of length 5 centimeters. So here is the line segment AB of length 5 centimeters. Our first step of construction will be draw a line segment AB of length 5 centimeters. Now we are given that angle A is equal to 60 degrees. So at point A let us draw angle XAB equal to 60 degrees. So here angle XAB is equal to 60 degrees. Our second step of construction is at point A draw angle XAB equal to 60 degrees. Now we have AC is equal to 4.3 centimeters. So with A as center we will draw an arc of radius 4.3 centimeters to cut AX at point C like this. So this is the point C with A as center and radius 4.3 centimeters draw an arc to cut AX at point C. Now to get the triangle ABC join BC like this. So our first step of construction is join BC. So here AC is equal to 4.3 centimeters. Thus triangle ABC is the required triangle. Thus here we have constructed a triangle when the lengths of two sides that is AC and AB and the angle between them that is angle A are known. With this we finish this session. Hope you must have enjoyed it. Goodbye, take care and keep smiling.