Name the types of following triangles :
`Delta` XYZ with `m angle Y = 90^(@)` and XY = YZ.

Name the types of triangles formed in two different ways in each of the following : (i) A triangle in which one angle is of 90^(@) , and the other two angles are equal. (ii) A Delta ABC with m angle A = 40^(@), m angle B = 60^(@) and m angle C = 80^(@) . (iii) A triangle in which one angle is obtuse and the other two angles are equal.

Construct a triangle XYZ in which angleY=30^@ , angleZ=90^@ and XY + YZ + ZX = 11 cm

Draw a triangle PQR with angle PQR is equal to 90^(@) .

(B) Solve any two of the following subquestions : Delta XYZ ~ Delta DEF , XY = 5.1 cm , Y Z = = 3.9 cm, XZ = 6 cm, XY : DE = 3: 2, Construct Delta XYZ and Delta DEF.

The following sentences are the steps involved in construction of the incircle for the triangle XYZ in which /_Y =90^(@), XZ=6 cm and YZ =4 cm. Arrange them in sequential order from the first to the last. (A) Mark the foot of the perpendicular from I onto YZ as D. (B) Construct the triangle XYZ with /_ Y =90^(@),XZ=6 cm and YZ =4 cm . (C ) Draw a circle with I as the centre and ID as radius. This is the required incircle. (D) Draw the bisectors of /_ X, /_ Y and /_Z and mark their point of concurrence as I.