can you please solve this question, exam tomorrow

This topic has expert replies
Junior | Next Rank: 30 Posts
Posts: 20
Joined: Fri Nov 13, 2009 3:42 pm
Thanked: 1 times
q: If P is the perimeter of the equilateral triangle. what is the height of triangle

A) p/3
b) Punder rt 3/3
c) p/4
d) p under rt3/6-- ans
e) p/6

Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Fri Oct 30, 2009 11:33 am
Thanked: 1 times

by satishscat » Mon Nov 23, 2009 8:08 am
This can be solved by plugin

Assume P = 12, So S=12/3 = 4 each side for an equilateral triangle
split the eq. triangle in two halves, the vertical line is the height H
consider this now as a right angled triangle with hypot - 4 , base = 4/2 = 2
use pytho theorm 2 square + H Square = 4 square; H = 2 sqrt 3

Substitute : P=12 , in each of the answers below . The one which gives 2 sqrt 3 is the answer i.e D

Senior | Next Rank: 100 Posts
Posts: 37
Joined: Tue Nov 10, 2009 9:29 pm
Thanked: 1 times

by RoadtoIVY » Mon Nov 23, 2009 9:04 am
Always remembr : In an equilateral triangle,
Height = sqrt3.a/2 where a is the side of an equilateral triangle.
In this case a = p/3