Prove the area of circle of radius r is or square units
for what value of k the points (k,-2), (1,4) and (-3,16) in given order are collinear
Number of 4 digit numbers that can be formed using the digits 1, 2, 3, 4, 5 if no digit is repeated
determine whether 50cm,80cm,100cm can be the sideof a right triangle or not.