Use ΔDEF, shown below, to answer the question that follows
1 answer:
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Answer:
120 degrees
Step-by-step explanation:
Attached is a screenshot.
y = 180 - 50 - 70 = 60.
x + y = 180, so x = 120
Remember to try to use parallel lines when you can
The second uses the same method, just the opposite side.
The formula of the volume of a cylinder:
We have:
and
substitute:
Answer: The area of a base of the cylinder is equal 45 dm².
We have:
and
substitute:
Answer: The area of a base of the cylinder is equal 45 dm².