Trigonometry - In a right angled triangle,opposite is 1.2m,adjucent is 7m,what will be the?

apply the pythagorean theorem, the square of the hypotenuse is equal to the sum of the squares of the two legs

h² = 1.2² + 7²
h² = 1.44 + 49
h² = 50.44
square both sides
√(h²) = √50.44
h = 7.10m