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15-03-2016
Mathematics

contestada

The choices are
A. 6cm
B. 218cm
C. 91cm
D. 120cm

The choices are A 6cm B 218cm C 91cm D 120cm class=

Respuesta :

15-03-2016

This is simple Pythagoras. You are given two sides, so you do:

[tex] c^{2} - a^{2} = b^{2} [/tex]
(13 is c, and 7 is a)

So:

13² - 7² = c²
c² = 120
√120 = 10.95
c = 10.95

However, they haven't given you this option, so I think you just leave it in terms of c², which is D. 120cm.

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