Question

ABCD is a rectangle whose three vertices are B (4, 0), C(4, 3) and D(0,3). The length of one of its diagonals is 
(A) 5
(B) 4
(C) 3
(D) 25

Answer 1

Correct answer: A

We see that AB = 4 units and BC = 3 units
Using Pythagoras theorem
 AC²= AB²+ BC²
=4² + 3²

 AC ² =25
Thus AC = 5 units
Hence length of the diagonal of the rectangle is 5 units