Transcript 11_2 - Castro Valley High School

CHAPTER 11
AREAS OF PLANE FIGURES
11-2
AREAS OF PARALLELOGRAMS,
TRIANGLES, and RHOMBUSES
THEOREM 11-2
THEOREM 11-2
The area of a parallelogram equals the
product of a base and the height to that
base.
!!!!!This side is
not the height!!!!
h
b
A = bh
THEOREM 11-2
Find the area of the figure.
60°
2
10
24√3 un²
THEOREM 11-2
Find the area of the figure.
9
6
45°
27√2 un²
THEOREM 11-3
THEOREM 11-3
The area of a triangle equals half the
product of a base and the height to that
base.
h
b
A = ½ bh
THEOREM 11-3
Find the area of the figure.
12 mm
46 mm
276 mm²
THEOREM 11-4
THEOREM 11-4
The area of a rhombus equals half the
product of its diagonals.
A = ½ d1 d2
In rhombus ABCD, AC = 20 and BD = 15. The
area can be found in more than one way.
A
B
12
D
C
A = 150 un²
CLASSWORK/HOMEWORK
11-2 ASSIGNMENT
• Pgs. 430-431, Classroom Exercises 1-9
• Pgs. 431-432, Written Exercises 2-24
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