Two angles that make a right angle are complementary; two that make a straight line are supplementary. The harder levels give the pair as a ratio instead of a number.
Swapping the two words. Complementary is the smaller total, 90, and supplementary is 180. A quick check: a complement only exists for an angle under 90.
Also called complementary angles, supplementary angles or angle pairs.
What you can put on this worksheet
Complementary angles
Find the complement→ 40∘
Supplementary angles
Find the supplement→ 80∘
Two angles in a ratio
Two supplementary angles are in the ratio 1:8. Find the smaller one→ 20∘
Questions about these worksheets
Yes. Every angle relationships sheet is free to print and free to download as a PDF. There is no account to make, no email to hand over and no limit on how many you take.
Yes. The answer key prints on a second page, and you can choose whether it shows each question beside its answer or just the answers in a list.
Yes. Print straight from the page, or download the PDF and print that. The sheet is laid out for paper rather than squeezed off a screen, so there is room to work under each question, and the answer key comes out on its own page.
Pre-Algebra is usually taken around 7th or 8th grade, though schools vary and plenty of students meet it earlier or later. Pick the difficulty rather than the grade: the easy level suits a first lesson on it, the hard level suits review before a test.
Yes, as many as you like. The questions are built fresh each time rather than picked from a fixed set of files, so pressing Generate gives a new sheet. That is what you want for a second class, a retake, or two students sitting next to each other.
That is the closest comparison, and Kuta Software is good software. It is also paid software you install on a computer. These worksheets run in a browser tab for free, with no account and nothing to install. Like Kuta, the angle relationships questions are generated when you ask for them rather than pulled from a fixed set of files, so two classes never get the same sheet, and the answer key comes with it.
Yes. There are three levels, and you can tick more than one for a sheet that mixes them, in which case the questions come out easiest first. The harder levels are not just larger numbers: they ask for something the easy ones do not.
You pick from 3: complementary angles, supplementary angles and two angles in a ratio. Tick as many as you want and set how many of each, or let it spread them evenly.
Swapping the two words. Complementary is the smaller total, 90, and supplementary is 180. A quick check: a complement only exists for an angle under 90.