bullockarwen
19.10.2019 •
Mathematics
Joseph runs half marathons and wants to keep track of the miles he has run each half marathon is 13.1 miles how many miles will he have to run after several half marathons
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Ответ:
40 cm²
Step-by-step explanation:
Given the ratio of radii = a : b , then
ratio of areas = a² : b²
Here ratio of radii = 1 : 2
ratio of areas = 1² : 2² = 1 : 4
Thus
surface area of large sphere = 4 × 10 = 40 cm²