PLEASE HELP!! In isosceles triangle ABC, AC=BC=20, m

Question

PLEASE HELP!! In isosceles triangle ABC, AC=BC=20, m<A=68, and CD is the altitude to side AB, what is CD to the nearest tenth?
A) 49.5  B)18.5  C)10.6  D) 7.5

accessdenied · Answer

try drawing a picture, an isosceles triangle with altitude CD...  then you can write all the information you know on it and see visually what's going on

from there, i do think you just use some basic trigonometry to find a ratio between a side you know and CD using your known angle

anonymous · Answer

what's altitude though?

accessdenied · Answer

an altitude is a line drawn from the vertex to the opposite side that is perpendicular to that side

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