What shape could be rotated about the y-axis as shown below to form a square pyramid?

a) sphere
b) cone
c) cylinder
d) none of the above

Option: D is the correct answer.

D) None of the above.

Step-by-step explanation:

Clearly from the figure attached to the question we could see that there is no shape given. Hence without any shape given in the figure and after rotation we can't obtained a square pyramid.

Since, to obtain a image we need a proper figure of the pre-image so that it can be transformed.

Hence, the correct answer is:

D) None of the above.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet