Answer:

Step-by-step explanation:

You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb
Shaded circles = 4
Total circles = 12

=


as a simplified expression =
We can simplify it even more =

Fraction =

Equivalent decimal = 1 ÷ 3 = 0.33
5.5 × 2= 11
11 is the length.
perimeter= 11+11+5.5+5.5
The perimeter is 33 units.
Answer:
a) 5:3
b) 7.5:5.3
Step-by-step explanation:
150min : 90min (1 and a half hour)
10 : 6
5 : 3
150 × 10 mm : 1060 mm
1500 : 1060
750 : 530
7.5 : 5.3