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20.03.2021 •
Mathematics
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Area and circumference of circles challenge
A round cake has a diameter of 30 cm. Angela places the cake on a circular cake board with a diameter 5 cm
longer than that of the cake.
What is the circumference of the cake board?
Give your answer in terms of T.
cm
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Ответ:
I uploaded the answer to a file hosting. Here's link:
cutt.ly/zxt1ipy
Ответ:
404.89 feet
Step-by-step explanation:
Hi, since the situation forms a right triangle (see attachment) we have to apply the next trigonometric function.
Tan α = opposite side / adjacent side
Where α is the angle of elevation of the bird (B), the opposite side (x) is the length of the bird above the ground, and the adjacent side is the distance between the school (S) and the observer (O).
Replacing with the values given:
Tan 39 = x/ 50 0
Solving for x
tan39 (500) =x
x= 404.89 feet
Feel free to ask for more if needed or if you did not understand something.