This is Geometry: In an isosceles triangle, the base is 8 inches long and the legs are 10 inches long. Find the measure of a base angle.

Question

anonymous · Answer

the perpendicular to the base cuts the base in two.
so cosine of the base angle is 1/2 * 8 / 10 = 2/5
so cos base angle = 0.4
- a job for ur calculator

anonymous · Answer

ok?

anonymous · Answer

you need trigonometry to solve this as well as geometry

bbb911 · Answer

here is a multiple choice question A. 84 degrees B. 66 degrees C. 10 degrees D. 6 degrees

anonymous · Answer

thats the possible answers right? but whats the question?

bbb911 · Answer

the question right up above

anonymous · Answer

oh yes ! sorry - but haven't you got a calculator  to do this bbb?
It will be good practice for you.

anonymous · Answer

have u understood the method i've used?

bbb911 · Answer

umm do i have to use a calculator? because i dont have a scientific one :o

anonymous · Answer

u need a scientific one to do this
u need to find the angle whose cosine is 0.4
the answer is 66 degrees

bbb911 · Answer

oh yes i see now yea needs me to buy one thank you for your help i will be your fan :D

anonymous · Answer

ty - but  buy one - they are very cheap

bbb911 · Answer

oh ok thanks will do :)