Pyramid problems

[Loki123]

I have a pyramid, I have height, perimiter, a, b, c (all sides of the base triangle) . I need to calculate the area of each of the side faces, that is the area of the three triangles without the base triangle. I did it. Kind of. I am off by 0.3, but that's possibly due to square roots which is why I am posting this here. I had to use the calculator to solve this because of the square roots. I won't have the calculator with me during exams, so are there any other ways to solve this?

 

[BigBeachBanana]

You can approximate square roots by comparing them to perfect squares. For example, [math]\sqrt{16}\le\sqrt{17}\le\sqrt{25} \implies 4\le\sqrt{17}\le5[/math]

 

[Deleted member 4993]

If calculators are not allowed, most of the instructors will allow you to leave the answer in radical form.

 

[Loki123]

If calculators not allowed, most of the instructors will allow you leave the answer in radical form.

the answer in the book is written in decimals which is why i thought i missed something.