Which of the following relations is correct?

Correct answer: a γ = (3/2)β

With γ = 3α and β = 2α, γ : β = 3 : 2, that is γ = (3/2)β.

Why the other options are wrong

• b α = 3β: This makes α the largest, but α is the smallest: β = 2α and γ = 3α.
• c β = 2γ: β = 2α and γ = 3α, so γ is larger than β; β = 2γ cannot hold.
• d γ = 2α: In the book 2α is β (the area coefficient); the volume coefficient is γ = 3α.