Answer:
For the first one, it is 1150. For the second one, it is 2460.
Step-by-step explanation:
Think of 23 x 50 as (20 x 50) + (3 x 50).
20 x 50 is 1000. 3 x 50 is 150. 1000 + 150 is 1150.
Think of 30 x 82 as (30 x 80) + (30 x 2)
30 x 80 is 2400. 30 x 2 is 60. 2400+60 is 2460.
The arc length is a quarter of the circumference of the full circle, so 2πr/4.
The straight sides are both radii, so each length r.
Total perimeter
p = 2πr/4 + r + r = r(π/2 + 2)
We put in r=2, π=3.14 and get
p = (2(3.14/2 + 2)) = 3.14 + 4 = 7.14
Answer: 7.14 km
K could either be a 16 or -24
472 to the nearest 100 is 500
