Task

I have homework.
The cube has an edge 7 cm long and I must find wall and body diagonal.

Correct result:

d1 =  9.9 cm
d2 =  12.124 cm

Solution:

d1=a2+a2=2a=27=9.9 cmd_1 = \sqrt{ a^2 + a^2 } = \sqrt{2} a = \sqrt{2} \cdot 7 = 9.9 \ \text{cm}
d2=d12+a2=2a2+a2=3a=37=12.124 cmd_2 = \sqrt{ d_1^2 + a^2 } = \sqrt{ 2 a^2 + a^2 } = \sqrt{3} a = \sqrt{3} \cdot 7 = 12.124 \ \text{cm}



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Pythagorean theorem is the base for the right triangle calculator.
See also our trigonometric triangle calculator.

 
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