Answer:
#5
Area = Area of bigger triangle - Area of small triangle

#8
Area = area of square + area of two right angled triangles

Answer: 1) equation relating both
N+F = 19
2)N = 7
Step-by-step explanation:
N+F =19
He folded 12, so F = 12
N = 19-12 = 7
Answer:
27
Step-by-step explanation:
If the ratio is 1:3 multiply that by 9:9 so you effectively get 9:9x3 = 9:27. Or, you can say to yourself if B (3) is 3 times greater than A (1) then B is 3 times greater than 9. So 9x3 = 27
Answer:
C.
Step-by-step explanation:
<D and <A are vertical angles.
Vertical angles are congruent.
Congruent means the same or equal.