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Answer key for Grade 8 Geometry

by Mr. Pelletier on April 14th, 2014

Intersecting Lines

1. 1=65

2. 2=52

3. 3=115

4. 4=135

5. 5=104,  6=76, 7=76

6. BPD=90, BPC=51, APE=39

7. POT=28, POQ=152, ROT=152, ROS=76

8. 1=115, 2=115, 3=65

9. 4=123, 6=123, 6=57

10 7=104, 8=104

11. 1=25, 2=55, 3=25, 4=100

12. 5=50, 6=45, 7=85

13. 8=70, 9=110, 1=43

14. 2=65, 3=75, 4=75

15. 5=80, 6=100, 7=12, 8=88

16 UW||TY, QU||RT

17. AF||CD, BF||EH

18. HK||PM, JL||NP

Triangles

1. 65

2. 118, 25

3. 48, 79, 53

4. 63, 117, 63, 50, 67

5. 70, 40

6. 36, 36

7. 136, 22

8. 72, 72, 36, 36, 72

9. 34, 146

10. 63, 76, 139, 139

11. 60, 60, 120

12. 27, 126, 63

13. 60, 45, 105

14. 75, 65, 30, 45, 55

15. 60, 40, 120, 120

16. QV||ST, PV||QS

17. BG||CF, CG||DF, AE||FG

18. MS||NK, NS||PR

Quadrilaterals

1. 105, 45

2. trapezoid, 100, 65

3. parallelogram, ON, 120, 60, 20, 40

4. 2.7, 3.08, 75, 105

5. rectangle, 13, 6.5 isosceles, isosceles

6. rhombus, isosceles, 90, right, 40, 100, 40

7. trapezoid, 54, 54, 72

8. rhombus, 10, 8, 12

9. square, 90, 45, sqrt(50)

10. parallelogram, trapezoid, 130, 50, 50, 50

11. grade 9 question, don’t do

12. grade 9 question, don’t do

13. BG||EF, AG||EC

14 a) rectangle or square

b) the sides are equal length

c) rectangle or square or rhombus

d) 60

 

 

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