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Please help!!!! full answers please!!
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Please help!!!!
full answers please!!

Please help!!!! full answers please!!-example-1
User Cerad
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We must use the trigonometric function.

(a)\\\sin(\angle BAC)=(ground)/(plank)\\\\\sin49^o=(3)/(|AC|)\\\\\sin49^o\approx0.7547\\\\(3)/(|AC|)=0.7547\\\\0.7547|AC|=3\ \ \ |:0.7547\\\\|AC|\approx3.9750\approx4\ ft.
We can use the Pythagorean theorem.

(b)\\|BC|^2+3^2=4^2\\\\|BC|^2+9=16\ \ \ |-9\\\\|BC|^2=7\to|BC|=\sqrt7\\\\|BC|\approx2.6458\\\\|BC|\approx3\ ft.
User Senthil Arumugam SP
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