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24.05.2021 •
Mathematics
A helium balloon on a string is tethered to a fence
outside of a house. The altitude of the balloon can
be represented by the rational number 12 1/4 feet.
The string breaks and the balloon ascends 20 feet
per minute for 5 minutes. The helium then begins
to leak out of the balloon, causing it to descend at
3 1/2 feet per minute for 4 minutes. What is the
elevation of the balloon after it descends for 4
minutes?
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Ответ:
A) ∠BEI ≅ ∠CEH because vertical angles are congruent; rotate ΔCEH 180° around point E, then translate point C to point B to confirm∠IBE ≅ HCE.