The formula to calculate the lateral area of a cone is given by

where
LA=10.5pi in2
r=2.1 in
l=? slant height
substitute given values

<h2>The answer is 5 inches</h2>
The height of the Washington monument is 555.146.
I got this by using trigonometry “tan(77) • 118”
Assuming you want to choose 4 people from the class of 20;
Begin by using the combinations formula;
20C4=4845 possibilities
Hope I helped :)
The answer is 80.5 ... 805 / 5