Question

Construct a right angled triangle with hypotenuse 9cm long and one of the legs 4cm long

Answer 1

you have to make the base of 4 cm with scale and make 90° on one of its end and then cut its  height take it by P.T. and join it

Answer 2

first take the base as 4 cm long and place the needle of the compass on the left, point and make a 90 degree angle, now open the compass 9 cm long and by placing the needle on the right point of the base cut an arc on the 90 degree angle. Join all the points and label the figue. I have also attached a picture which will help you.