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christylivingsowzxa2
22.09.2019 •
Mathematics
The scale on a map is 1 cm : 6.5 mi. the actual distance between amelia's school and her house is 45 miles. how far apart are they on the map?
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Ответ:
about 6.9 cm
Step-by-step explanation:
Set up a proportion to solve this problem.
1 cm is to 6.5 miles as x cm is to 45 miles
1/6.5 = x/45 now solve for x by cross multiplying
45 = 6.5x
45/6.5 = x
6.923076923 cm = x
Ответ:
Step-by-step explanation:
You can use the same formula in each case. The area of a triangle with sides "a" and "b" separated by angle α is ...
A = (1/2)ab·sin(α)
1. The area of the square is 4 times the area of the right triangle whose legs are radii of the square:
square area = 4·(1/2)·(13 m)(13 m)sin(90°) = 2·(13 m)² = 338 m²
__
2. The area is ...
A = (1/2)(8 cm)(12 cm)sin(81°) ≈ 47.4 cm²
For this one, you don't need to work out the answer in detail. You know it will be less than, but nearly, 48 cm², which is half the product of the side lengths.