homework answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11....

Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

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Homework Answers

1. 240 cm2

2. 26.79 in2

3. 20.3 m2

4. 11.2

7. 14 m2

8. 13.5 yd2

9. 3 ft2

11. 4 in

12. B

13. 14 cm

17. 15 units2

18. 6 units2

Areas of Trapezoids, Rhombuses and Kites

Math 2 - Lesson 78Mr. Lopez

Page 3: Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

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

Page 4: Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

Practice

• Approximate the area of Arkansas using the trapezoid shown.

190 miles

250 miles

242

mile

260

mile

Page 5: Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

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

7m60

Page 6: Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

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

Rhombus

Kite

Page 7: Homework Answers 1. 240 cm 2 2. 26.79 in 2 3. 20.3 m 2 4. 11.2 7. 14 m 2 8. 13.5 yd 2 9. 3 ft 2 11. 4 in 12. B 13. 14 cm 17. 15 units 2 18. 6 units 2

Practice

• Find the area of kite KLMN

• Find the area of Rhombus ABCD

352

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