A=1/2 (b1+b 2)(h) is the area of a trapezoid
Answer:
9 years
Step-by-step explanation:
Answer:
20 seconds
Step-by-step explanation:
The period is the value of t that makes the cosine argument change by 2π.
That value is ...
2π = π/10t
20 = t . . . . . . . multiply by 10/π
The period of the function is 20 seconds.
Answer:
C
Step-by-step explanation:
The central angle is equal to the arc that subtends it, that is 54°
area of sector = area of circle × fraction of circle
A = πr² × 
= π × 10² × 
= 100π ×
( cancel 20 and 100 )
= 5π × 3
= 15π cm² → C