Question

Calculate the length of the unknown side in each of the following right-angled triangle​

Answer 1

Ok let’s apply Pythagorean theorem

Ac^2 = Ab^2+ Bc^2
Here ab = 21
Ac = 28

Therefore

Ac^2 = (21)^2+(28)^2
=441+784
=1225

Now Ac^2 = 1225
Therefore AC = sqrt (1225)
Ac = 35

I hope it will help you

Thank you

Answer 2

Step-by-step explanation:

in right angle triangle

(length) ^2+(base) ^2=(Hypotenuse)^2

(28)^2+(21)^2=(unknown side) ^2

784+441=x^2

1225=x^2

x=√(1225)=35

so unknown side will be 35 cm