Write in symbols.

(1) The positive square root of 400

(2) The negative square root of 81

(3) The negative square root of 121

(4) The positive square root of 1

Write the square roots of each of the following numbers.

(1) 9 (2) 25

(3) 100 (4) 196

(5) 324 (6) 576

Write the following numbers in words.

Write the values of

(1) (2)

(3) (4)

(5)

The sides forming the right angle of a right angled triangle are 7 cm and 5 cm. Find the length of its hypotenuse.