Exercise 6.1, Mental Math A And B, About Parallelograms And Their Properties, 1 - 15 Pls Help

Exercise 6.1

Mental math A and B
About parallelograms and their properties
1 - 15 pls help

Answer:

6. 2.5 cm

7. 3 1/2 inch

8. 20 mm

9. 15 units

10. 1.5 inches

11. 112

12. 78

13. 120

14. 36

15. <DEC = 119; <DEA = ?


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