Question

Help anyone can help me do this question,I will mark brainlest.​

Answer 1

Answer:

Hello,

Step-by-step explanation:

$Using\ the\ Pythagorian's\ theorem,\\\\EC^2=EA^2+AC^2\\\\=EA^2+AB^2+BC^2\\\\=3*5^2\\\\EC=5\sqrt{3} \approx{8,660...}$

Answer 2

side of cube=5

We know

$\boxed{\sf Side=\dfrac{Diagonal}{\sqrt{2}}}$

$\\ \sf \longmapsto Diagonal =sude\times \sqrt{2}$

$\\ \sf \longmapsto Diagonal=5\sqrt{2}$

$\\ \sf \longmapsto Diagonal=5\times 1.4$

$\\ \sf \longmapsto Diagonal=7cm$