the demension of side a is 2inches and the dimension of side b is4inches calculate dimension of side c?

Answer 1

A bit more description would have been nice...anyway, judging by the fact that there are 3 sides, and they are appropriately labeled a, b, and c, I will assume you want to use the Pythagorean theorem.

c^2 = a^2 + b^2

c^2 = 2^2 + 4^2

c^2 = 4 + 16

c^2 = 20

c = √20 = 2√5

Answer 2

You need to give further data such as there are only three sides and we are talking about a triangle. The only way you could figure the third side would be to tell us the angle included between side a and side b. Then the law of cosines could be used. If the angle is a right angle, the law of cosines becomes the Pythagorean theorem. But in mathematics, things need to be well-specified or a lot of time can be wasted solving a problem which was incorrectly stated.

Answer 3

I`m going to assume this is a triangle, since you have three sides. I'm also going to assume it's a right triangle, which is a pretty big assumption, because if it isn't a right triangle my answer is going to be way off.

Pythagorean Theorem:
a^2 + b^2 = c^2
sooo

2^2 + 4^2 = c^2
4+16=c^2
20=C^2
sqrt20 = c
2sqrt5=c

Answer 4

Use pythagorean theorem.
c^2 = 2^2 + 4^2 = 20
c = sq rt 20 = 2 sq rt 5