1. Homework Answers 1. 240 cm2 2. 26.79 in2 3. 20.3 m2 4. 11.2 7. 14 m2
yd2
9. 3 ft2
11. 4 in
12. B cm
units2
18. 6 units2

2. Areas of Trapezoids, Rhombuses and Kites
Math 2 - Lesson 78
Mr. Lopez

3. Area of Trapezoid
The area of a trapezoid is half the product of the height and the sum of the bases.
The bases are the parallel sides of the trapezoid.
The height is an altitude from one base to the other.
Area = ½(base1 + base2) x height
base1
base2
height

4. Practice Approximate the area of Arkansas using the trapezoid shown.
190 miles
250 miles
242 miles
260 miles

5. More Practice
What is the height of the trapezoid if its bases are 12 cm and 15 cm with an area of 272 cm2? Round to nearest whole number.
What is the area of the following isosceles trapezoid ABCD?
Round to nearest tenth 5m 60 7m

6. Area of a Rhombus or Kite
The area of a rhombus or a kite is half the product of the lengths of its diagonals.
Area = ½d1d2 d2 d2 d1 d1
Rhombus
Kite

7. Practice Find the area of kite KLMN Find the area of Rhombus ABCD 3 25 3 15 12