Answer:

1. 13

2. 18

3. 21

4. 18

5. 102

6. 102

7. 78

8. 78

Step-by-step explanation:

Properties of Isosceles Trapezoid

• two parallel sides
• two legs are equal
• two base angles are equal

1-4sl solution

P = FI + IN + EN + EF

{EF = IN}

70 = x + x+5 + x+8 + x+5

x = 13

substitute x

FI = 13

IN = EF = 13+5 = 18

EN = 13 + 8 = 21

5-8

angle F + angle I + angle N + angle E = 360

angle F = angle I

angle N = angle E

3y+12 + 3y+12 + 2y+18 + 2y+18 = 360

y= 30

F = I = 3(30) + 12 = 102°

N = E = 2(30) + 18 = 78°