Trigonometry

[pedro_90]

Hi,

I've got a take home test. Im almost done just have a few questions to go. I was wondering if someone could help me. The question The vertical angle of an isosceles triangles if 40degrees and it's area is 40msquared. Find the length of the equal sides correct to the nearest mm.
:?:
Thanks alot :lol:

 

[Denis]

I've got a take home test. Im almost done just have a few questions to go. I was wondering if someone could help me. The question The vertical angle of an isosceles triangles if 40degrees and it's area is 40msquared. Find the length of the equal sides correct to the nearest mm.

Draw a perpendicular from the 40degree to the triangle's base;
this perpendicular is height of triangle;
h = height, b = base; so area = bh / 2
bh / 2 = 40
bh = 80

And the perpendicular gave you 2 identical right triangles 90-20-70.

Can you carry on?

 

[pedro_90]

Yes Thank you alot