Hint: Use Law of Cosine
Determine the approximate value of c.
Law of Cosines
Standard Form
2
.2-2bccoul)
6 cm
2.
.
-2acco
cowo-
E SUN
2.2.3-2
)
COMC)20e
12
a.
b.
9.24 cm
10.8 cm
c. 11.3 cm
d. 14.0 cm

Fill in the blank 1. a rhombus is a rectangle a) always b) sometimes c) never 2. a square is a quadrilateral a) always b) sometimes c) never 3. a trapezoid is a kite a) always b) sometimes c) never 4. a quadrilateral is a kite a) always b) sometimes c) never 5. a square is a rhombus a) always b) sometimes c) never 6. a parallelogram is a rectangle a) always b) sometimes c) never