Question

Please help me answer the question ​

Answer 1

Explanation:

By Pythagoras' Theorem, the sum of squares of the side lengths of a right-angled triangle is the square of its hypotenuse.

In Question 11, 2^2 + 1^2 = a^2. a = √5.

In Question 12, 2^2 - 1^2 = b^2. b = √3.