Question

Use the square to answer the question.

Information
A square with a side length of 30.

Question
What is the length of a diagonal of the square?

Answer options with 4 options
A.
30

B.
30 StartRoot 2 EndRoot

C.
30 StartRoot 3 EndRoot

D.
60

Answer 1

B. 30√2

Reason: diagonal d satisfies d^2 = 30^2 + 30^2 = 1800, so d = √1800 = √(900·2) = 30√2.