Chapter 8: Q. 55 (page 542)
What do you do first if you are asked to find the area of a triangle and are given three sides?
The first thing we do in finding the area is
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The displacement d (in meters) of an object at time t (in seconds) is given
(a) Describe the motion of the object.
(b) What is the maximum displacement from its resting position?
(c) What is the time required for one oscillation?
(d) What is the frequency?
Circumscribing a TriangleShow that
where is the radius of the circle circumscribing the triangle PQR whose sides are a, b, and c, as shown in the figure.
A person in a small boat, offshore from a vertical cliff known to be feet in height, takes a sighting of the top of the cliff. If the angle of elevation is found to be, how far offshore is the boat?
Finding the Height of a Mountain Use the illustration in Problem 39 to find the height QD of the mountain.
Find the area of the triangle. Round answer to two decimal places.
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