Concave refers to an object curved inward like the inner surface of a ball; convex refers to an object curved outward like the outer surface of a ball.
(From Write for Business, page 228, and Proofreader's Guide PDF, page 40)
Write for Business - Blog
UpWrite Press understands the importance of writing skills in business: We're business people just like you. On this blog you'll find tips to improve your writing, along with topics of interest to our staff.
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