Posted by **Jared** on Monday, February 28, 2011 at 4:12pm.

A square is 7 meters on a side. To the nearest tenth of a meter, how long is the diagonal of the square?

A: 9.8

B: 9.9

C: 10.0

D: 14.0

- math -
**Helper**, Monday, February 28, 2011 at 5:34pm
The diagonal of a square forms two

45-45-90 triangles.

The sides of a 45-45-90 triangle are in the ratio,

a : b : hypotenuse

x : x : x(sqrt(2))

The diagonal is the hypotenuse of this 45-45-90 triangle.

Side = 7

7 * (sqrt(2)) = ?

- math -
**Ms. Sue**, Monday, February 28, 2011 at 5:35pm
a^2 + b^2 = c^2

7^2 + 7^2 = c^2

49 + 49 = 98

c = square root of 98

Be sure to round to the nearest tenth.

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