Trig Lesson 11 ­ Area of a Triangle
Do Now: Pre­Calc
Find the area of each triangle below.
2.
1.
7"
3cm
16"
3cm
3.
2
4.
/3
115 feet
5
/6
104 feet
Homework Answers ­ Tangent Lines/Review
1. A tangent line touches a circle at exactly one point AND a tangent line is perpendicular to a radius of the circle.
2.
3. 150o, 210o
4. 30o, 150o
1
Trig Lesson 11 ­ Area of a Triangle
Area of a Triangle
B
a
c
A
C
b
1. In ΔABC, b = 3, c = 8, and <A = 120o . Find the area.
2
Trig Lesson 11 ­ Area of a Triangle
2. What is the area of parallelogram ABCD given AB = 12, BC = 16, and sinB = 3/4?
3. The area of ΔDEF is 15√2. If <D = 135o and e = 10, find f.
3
Trig Lesson 11 ­ Area of a Triangle
4. What is the exact area of the triangle shown below?
P
6cm
Q
20o
10cm
10o
R
5. If a base angle of an isosceles triangle is 75o and each leg is 4, find the exact area of the triangle.
4