Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
February 11, 2015
11.2 Areas of Trapezoids, Rhombi, and Kites
Objecve: 1. You will be able to find areas of trapezoids. 2. You will be able to find areas of rhombi and kites.
When using formulas . . . 1. State the formula you will be using for the parcular problem.
2. Idenfy all knowns and unknowns.
3. Substute knowns and unknowns into the formula.
4. Solve for the unknown.
5. Check and declare answer.
*Remember to pay aenon to rounding rules and to include necessary labels.
Area of a Trapezoid: Formula:
Trapezoids and their heights (altudes) can have mulple appearances, sketch the ways that can appear:
Base
Base
Height
Base Base Height
Base Base
Height
Formula:
Area of a Rhombi/Kite:
d1
l
ll
d1
l
ll
l
l
l
d2
d2
l
Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
Example 1:
Trapezoid NOPQ has an area of 250 square inches. Find the height of NOPQ.
Example 2:
CUTOUTS A trapezoid is cut from a 6‐inch‐by‐2‐inch rectangle.
The length of one base is 6 inches. What is the area of the trapezoid?
February 11, 2015
Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
February 11, 2015
Example 3
A yard in the shape of a kite is to be reseeded. The owner measures the two diagonals and finds the lengths to be 42 feet and 23 feet. One bag or seed will cover 25 square yards and costs $12.99. If sales tax at the store is 7.45%, how much will it cost for the owner to reseed his yard twice this year? Example 4
Find the area of the rhombus.
20cm
60o
Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
February 11, 2015
Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
Pracce:
11.2 p.793
#9‐11,18,19,21,28,
30‐32,39‐42
February 11, 2015
Geo (H) 11.2 Areas of Trapezoids, Rhombi, and Kites.notebook
February 11, 2015