Pre-Calculus - Eduware
Pre-Calculus - Eduware
Pre-Calculus - Eduware
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V. TRIGONOMETRY 5. Trigonometry of Acute and Obtuse Angles<br />
C. Area of a Triangle Using Trig<br />
1671. To approximate the area of an irregularly shaped area of land, a map maker drew three adjacent triangles around the figure. Using<br />
the measurements obtained by the map maker, estimate the area of the plot of land based on the areas of the triangles, to the nearest<br />
foot.<br />
3211<br />
1287. In the accompanying diagram, ABCD is a parallelogram<br />
with AB = 20, AD = 10, and maA = 30. Find the area of<br />
parallelogram ABCD.<br />
100<br />
1291. In the accompanying figure of (ABC, a = 10,<br />
b = 10, and maA = 75. Find the area of (ABC.<br />
1329. In triangle ABC, a = 20, and maC = 30. For which value of<br />
b is the area of triangle ABC equal to 100 square units?<br />
(1) 10<br />
(2) 20<br />
(3) 20`3<br />
3<br />
(4) 25<br />
1347. Find the area of triangle ABC if a = 12, b = 15, and<br />
maC = 30.<br />
45<br />
1373. Find the area of (ABC if m
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