1. 11.2 Area of Special Quadrilaterals March 07, 2013
Find the area of the polygon. Bellwork
480 units2 480 units2
4. Find the area of a triangle
with side lengths 13 inches,
13 inches, and 10 inches.
60 in.2
414.0 units2
Mar 7­7:31 AM
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2. 11.2 Area of Special Quadrilaterals March 07, 2013
11.2 Areas of Trapezoids, Rhombuses and Kites
Objectives:
1. Apply area formulas of triangles, trapezoids, & kites to solve problems.
Formula for the area of a:
Rhombus: A = 1/2 d1d2
d1
d2
12mm
9mm
9mm
12mm
Jan 23­1:12 PM
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3. 11.2 Area of Special Quadrilaterals March 07, 2013
Trapezoid:
A =1/2h(b1 + b2)
Area = _____
10m
5m 7m
17m
Kites (which would apply to any rhombus):
To find the area of a kite, identify and label the diagonals asd1 and d2.
Then plug into the formula: A = 1/2d1d2
Area = _____
13cm
8cm
Jan 23­1:16 PM
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4. 11.2 Area of Special Quadrilaterals March 07, 2013
Find the missing measurements.
Trapezoid NOPQ has an area of 250 square inches.
Find the height of NOPQ.
20 in
N O
h
Q 30 in P
Rhombus RSTU has an area of 675 square meters.
Find SU.
R S
15m
15m
U T
Find the area of the quadrilateral.
F
G
9 in
18 in
I H
FH = 37 in
Jan 23­2:26 PM
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5. 11.2 Area of Special Quadrilaterals March 07, 2013
HW:
11.2 p.733
#3-29 odds
Jan 22­8:59 AM
HW pg. 733 #3­29 odds 5